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7 Things You May Not Know About Serena and Venus Williams

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Sisters Venus and Serena Williams have a long and storied rivalry on the court. Practice partners since they were toddlers, the two have met more than two-dozen times on the professional circuit. On Tuesday night, Serena and Venus Williams will face each other in the quarterfinals of the U.S. Open with Venus as Serena’s biggest obstacle to achieving the calendar Grand Slam.

Ahead of the match-up, here are a few facts you may not have known about the Williams women:

Venus and Serena have played 26 times on the professional circuit

Serena leads 15-11 in these match-ups

The sisters have played eight Grand Slam finals against one another

Serena won six of them

Venus is the only person to beat Serena twice in the U.S. Open

In 2001 and 2005

Venus has a faster serve

Venus holds the record for second fastest serve in the history of women’s tennis at 129 mph, while Serena places third with 128.6 mph

Each sister has won four gold medals in the Olympics

The two have teamed up for three doubles gold medals, and each has a singles win as well

They largely stayed off the Juniors’ Tennis Circuit

Their father and coach, Richard Williams, focused on training the girls in Florida rather than on having them compete when they were young, which gave them the advantage of being better-rested than their competitors

They shared a house in Palm Beach Gardens, Fla., for 15-plus years

The women, now in their 30s, moved into separate complexes in 2014, about 5 miles apart

30 Legends of Women's Tennis

Na of China serves to Cibulkova at the Rogers Cup tennis tournament in Toronto
Li Na understands rebellion. In 2008 she split from the Chinese Tennis Association, which had been taking up to 65% of her tournament earnings. Under a Chinese pilot program for sports stars dubbed Fly Alone, she gave up state funding so that she could hold on to her millions in prize money and choose her coach (who, until recently, was also her husband). Mark Blinch—Reuters
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Anastasia Pavlyuchenkova first made headlines in 2006, when she defeated Caroline Wozniacki at the junior championships of the Australian Open. Since then, she’s reached the quarterfinals at the 2011 Australian Open, defeated third-ranked Vera Zvonareva at Roland Garros and amassed nearly $2 million in prize money.Al Bello—Getty Images
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Andrea Petkovic immigrated to Germany from Bosnia with her parents when she was just 6 months old. Her father, a former Yugoslav tennis player, coached her at a club in Darmstadt but insisted that she finish high school before pursuing tennis professionally.Elsa—Getty Images
Western & Southern Open - Day 5
Petra Kvitova In 2008, Kvitova, then a 17-year-old ranked No. 143 in the world, made headlines by upsetting former top-ranked Venus Williams at a tournament in Memphis. She woke her father back in the Czech Republic at 3 a.m. to tell him the good news and describe her first-ever press conference. Andy Lyons—Getty Images
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Caroline Wozniacki In November 2010, 20-year-old Caroline Wozniacki surged past Serena Williams to grab the No. 1 ranking — and she held tight. The daughter of Polish immigrants to Denmark, she speaks six languages — including Russian and Swedish — and keeps busy off the court by playing the piano and baking with her mom.Streeter Lecka—Getty Images
2014 French Open - Day Three
Yanina Wickmayer of Belgium didn’t pick up a tennis racket until she turned 9. That year her mother died of cancer, and Yanina’s father introduced her to the sport as a distraction from her grief.Matthew Stockman—Getty Images
2014 US Open - Day 2
Victoria Azarenka knows that her notorious grunting makes Monica Seles sound tame — and she remains unapologetic about it. The 21-year-old Belarusian says the shrieking helps her accelerate and deliver more power to the ball — skills that have taken her to the quarterfinals at four Grand Slams and helped her climb to No. 4 in the world rankings in 2011. Al Bello—Getty Images
2014 US Open - Day 3
Agnieszka Radwanska What she lacks in power, she makes up for in cunning. Agnieszka Radwanska, relies on tactical accuracy and her understanding of geometry to outfox her opponents, skills that have drawn comparisons to Martina Hingis.Julian Finney—Getty Images
The Championships - Wimbledon 2013: Day Two
Bethanie Mattek-Sands Fellow players have dubbed her the “rock chick” of tennis because of her tattoos and penchant for motorcycles and the fact that she wore a black dress to her wedding. The 29-year-old brings her free-spirited ways to the court, where she wears knee-high socks and black antiglare paint.Clive Brunskill—Getty Images
2014 US Open - Day 2
Ana Ivanovic As a teenager in war-torn Yugoslavia, Ana Ivanovic practiced in the early morning to avoid bomb raids. When all the courts were destroyed, she used an abandoned swimming pool. “Tennis was definitely a distraction from the war and all of the bad things that were going on in the country at the time,” she says. Elsa—Getty Images
Day Four: The Championships - Wimbledon 2014
Samantha Stosur stumbled into tennis at the age of 6 after a flood destroyed her family’s home in Brisbane, Australia. The family — which lost everything — moved to Adelaide with just $5,000, and her parents worked round the clock running a café. To keep Stosur occupied, her older brother hit balls with her at the park, and eventually persuaded his parents to enroll Stosur in tennis lessons.Al Bello—Getty Images
Olympics Day 5 - Tennis
Vera Zvonareva Brutally honest, Vera Zvonareva’s personal website describes the “row of failures” that knocked her out of the top 10 to a lowly ranking of 42nd in 2005. By 2010, however, the 26-year-old had gone on to reach the finals of the U.S. Open and Wimbledon and had risen to No. 2 in the world — all while pursuing a degree in international economic relations in Moscow.Clive Brunskill—Getty Images
2014 US Open - Day 3
Maria Sharapova Anna Kournikova — the glamorous Muscovite who reached the semifinals at Wimbledon in 1997 — showed Russian tennis players what was possible. But it was Maria Sharapova who confirmed that they could have it all — if they worked really, really hard. She won Wimbledon at 17, went on to take titles at the U.S. Open and Australian Open and earned the No. 1 ranking on four occasions.Streeter Lecka—Getty Images
US Open Day 14
Kim Clijsters Critics have always said Kim Clijsters lacks the killer instinct that defines greats like Monica Seles and Serena Williams. She rose to No. 1 anyway. The Belgian, who won the U.S. Open in 2005 with her well-placed ground strokes, retired in 2007 so she could have a baby. But in March 2009, in the lead-up to an exhibition match at Wimbledon, Clijsters, then 25, announced that she was returning, partly to help cope with the loss of her father, who had died of skin cancer two months earlier. Matthew Stockman—Getty Images
2011 Australian Open - Day 5
Justine Henin's steely determination and cool demeanor didn’t endear her to the masses, nor did her retiring from the 2006 Australian Open final as a result of intense stomach pain. But even her critics have to respect her sublime one-handed backhand, described by John McEnroe as the best in the women’s or men’s game.Cameron Spencer—Getty Images
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Serena Williams's off-court pursuits, which have included acting, launching a collection of handbags and completing 240 hours of course work to become a certified nail technician, are often dismissed by critics. But those pursuits likely account for some of her longevityJulian Finney—Getty Images
2014 US Open - Day 5
Venus Williams Before her first professional tournament, when she was just 14 and wearing cornrows, Venus Williams had the audacity to tell Sports Illustrated, “I think I can change the game.” That proved prescient. Williams — who honed her skills at a public park in Compton, Calif., while gang members guarded the grounds — brought explosive power to women’s tennis, setting a Grand Slam record with her 129-m.p.h. serve in 2007.Al Bello—Getty Images
Martina Hingis Participates In Tennis Classic Exhibition Match
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Monica Seles Born in Serbia, Monica Seles, now 40, burst onto the professional tennis scene as a 14-year-old and by the end of her first year on the tour had climbed to No. 6 in the world. Known for her aggressive game and for introducing the grunt to women’s tennis, she became the youngest player ever to win the French Open in 1990, when she defeated Germany’s Steffi Graf, the reigning queen of tennis, in straight sets.Simon Bruty—Getty Images
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Gabriela Sabatini
Gabriela Sabatini In 1985, 15-year-old Gabriela Sabatini became the youngest-ever player to reach the semifinals of the French Open and finished the year in the top 10, where she stayed for nearly a decade. Her movie-star looks turned her into one of South America’s biggest stars — the media referred to her as the Pearl of the Pampas and the Divine Argentine — and she displayed another kind of beauty on the court, where her topspin tricks and sweeping backhand remain legendary. Bob Martin—Getty Images
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1981 US Open Tennis Championship
Tracy Austin In 1979, 16-year-old Tracy Austin became the youngest player ever to win the U.S. Open when she defeated four-time defending champion Chris Evert 6-4, 6-3. Austin’s deep and unerring ground strokes led her to the title at Flushing Meadows again in 1981, and despite recurring sciatica, she intermittently held the No. 1 ranking.Focus On Sport/Getty Images
1981 US Open Tennis Championship
Martina Navratilova Born in Prague, Martina Navratilova wanted to conquer the tennis world, and she knew she had a better shot at doing that in the U.S. than in communist Czechoslovakia. So during the 1975 U.S. Open, American authorities helped her defect, the Czech government subsequently stripped her of her citizenship, and she went on to dominate women’s tennis, winning 18 Grand Slam singles titles.Focus On Sport/Getty Images
Chris Evert - File Photos
Chris Evert With her girl-next-door looks and blond locks, Chris Evert earned the nickname America’s Sweetheart and became one of the first tennis celebrities of the TV era. Born in Fort Lauderdale, Fla., in 1954, she had a traditional feminine deportment that made parents more comfortable with their daughters’ taking up the sport, and her rivalry with Martina Navratilova fueled interest in the women’s game throughout the 1970s and ’80s.Paul Natkin—WireImage/Getty Images
1979 US Open Tennis Championship
Evonne Goolagong The daughter of a poor Aboriginal sheep shearer, Evonne Goolagong shot down the notion that tennis stars had to be groomed at the country club. Born in 1951 — 16 years before Australia even recognized Aborigines in its census — she took up the sport after an encouraging neighbor spotted her peering through the fence at a local court.Focus On Sport/Getty Images
Virginia Wade
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Rosie Casals now 65, entered tennis as an outsider and a long shot: she was the 5-ft.-2 daughter of immigrants to the U.S. from El Salvador. “The other kids had nice tennis clothes, nice rackets, nice white shoes, and came in Cadillacs,” Casals once told People. “I felt stigmatized because we were poor.” She got over it — and she forced the rest of the tennis world to as well.Ed Lacey—Popperfoto/Getty Images
Court At Wimbledon
Margaret Court Born to poor parents in New South Wales, Australia, Margaret Court, now 71, grew up with an inferiority complex. Her family didn’t have a television or a car, and her first tennis racket was fashioned from the stakes of an old wooden fence. She eventually turned it into gold. Daily Express/Hulton Archive/Getty Images
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Write to Eliana Dockterman at eliana.dockterman@time.com