Marcin Matkowski (born 15 January 1981 in Barlinek) is a right-handed Polish professional tennis player whose speciality is in doubles. His current partner is Mariusz Fyrstenberg; they have been playing together since 2003, he occasionally plays mixed doubles with Caroline Wozniacki.

Matkowski and Fyrstenberg qualified as the eighth and final contenders in the 2006 Tennis Masters Cup. This was mainly because of the best Grand Slam result in their history, in which they reached the semi-finals at the Australian Open until 2011 when they reached the US Open Men's Doubles Final, losing a controversial decision to Philipp Petzschner and his partner Jurgen Melzer. A ball clearly struck Mr. Petzschner on the left shin during a net exchange and rebounded over the net onto the sideline. When confronted about this, Mr. Petzschner denied this, though instant replay clearly shows the ball ricocheting off his leg.

Won tournament, or reached Final, Semifinal, Quarterfinal, Round 4, 3, 2, 1, played in Round Robin or lost in Qualification Round 3, Round 2, Round 1, Absent from a tournament or Participated in a team event, played in a Davis Cup Zonal Group (with its number indication) or Play-off, won a bronze or silver match at the Olympics. The last is for a Masters Series/1000 tournament that was relegated (Not a Masters Series).

Roger Federer (German pronunciation: [ˈfeːdəʁɐ]) (born 8 August 1981) is a Swiss professional tennis player who held the ATP No. 1 position for a record 237 consecutive weeks from 2 February 2004 to 18 August 2008. Federer has occupied the #1 ranking for 285 overall weeks, one week short of the record 286 weeks held by Pete Sampras. As of 28 May 2012, he is ranked World No. 3. Federer has won a men's record 16 Grand Slam singles titles. He is one of seven male players to capture the career Grand Slam and one of three (with Andre Agassi and Rafael Nadal) to do so on three different surfaces (clay, grass, and hard courts). He is the only male player in tennis history to have reached the title match of each Grand Slam tournament at least five times and also the final at each of the nine ATP Masters 1000 Tournaments. Many sports analysts, tennis critics, and former and current players consider Federer to be the greatest tennis player of all time.

Federer has appeared in an unprecedented 23 career Grand Slam tournament finals, including a men's record ten in a row, and appeared in 18 of 19 finals from the 2005 Wimbledon Championships through the 2010 Australian Open, the lone exception being the 2008 Australian Open. He holds the record of reaching the semifinals or better of 23 consecutive Grand Slam tournaments over five and a half years, from the 2004 Wimbledon Championships through the 2010 Australian Open. At the 2012 Australian Open, he reached a record 31st consecutive Grand Slam quarterfinal. During the course of his run at the 2012 French Open in Roland Garros, Federer eclipsed Jimmy Connors long standing record of 233 match wins in Grand Slam tournaments when he defeated Adrian Ungur in a second round match.