Juan Martín del Potro (Spanish pronunciation: [ˈxwan marˈtin del ˈpotɾo]) (born 23 September 1988) is an Argentine professional tennis player. As of 14 May 2012, he is ranked no. 9 by the Association of Tennis Professionals (ATP). Del Potro achieved a top-10 ranking by the ATP for the first time on October 6, 2008. In January 2010, he reached a career-high ranking of world no. 4. Soon after attaining this ranking, however, Del Potro had to withdraw from most of the tournaments in 2010 due to a wrist injury, and his ranking plummeted.

Having started playing tennis at the age of seven, Del Potro won his first senior match in 2004 at the age of 15. Del Potro became the youngest player to finish in the Top 100 in 2006, the youngest player in the top 50 in 2007, and youngest player in the top 10 in 2008. In 2008, he became the first player in ATP history to win his first four career titles in as many tournaments. He also completed the second-longest winning streak in 2008, and the second longest by a teenager in the Open Era, behind Rafael Nadal—with his winning sequence spanning 23 matches over five tournaments. Del Potro captured his first Grand Slam title at the 2009 US Open, defeating Nadal in the semifinal, and Roger Federer in the final, becoming the first man to beat both Federer and Nadal in the same Grand Slam tournament (later achieved by Novak Djokovic at the 2011 US Open). He became the second Argentine and the fifth-youngest man to win the US Open title in the Open Era. At 1.98m (6 ft, 6 in), he is the tallest player to have ever won a Grand Slam.

Sam Austin Querrey (born October 7, 1987) is a professional American tennis player from Thousand Oaks, California currently living in Las Vegas, Nevada. His current ATP rank is 71, with a career high rank of #17, achieved on January 31, 2011. His height allows him to play with a strong serve and forehand. Querrey holds the record for most consecutive service aces since the ATP began keeping records of those statistics, with 10 in a 2007 match against James Blake. His regular doubles partner is fellow American John Isner.

Many tennis experts, including Davis Cup Captain Patrick McEnroe, have touted Querrey as America's next great talent.^{[citation needed]}

Querrey turned down a scholarship offer from USC to turn pro. His father Mike Querrey recommended that his son try making it in tennis, as he often regretted his own decision to go to the University of Arizona rather than play baseball for the Detroit Tigers which had drafted him. Sam Querrey said that going pro was "one of the toughest decisions of my life."