1978 in Grône, Switzerland) began his professional career in 1997, peaking at no. 32 in doubles in 2004. Allegro collected three doubles titles on the main tour. He played his last event in the main circuit at the 2011 Crédit Agricole Suisse Open Gstaad and in the challenger circuit at the 2011 Città di Como Challenger in August. Mario Ančić (born 30 March 1984 in Split, SFR Yugoslavia, now Croatia) joined the circuit in 2001, and peaked at no. 7 in singles in 2006 and no. 47 in doubles in 2004. A junior world no. 1, Ančić won three singles and five doubles titles on the main tour, scoring his best Grand Slam results with a quarterfinal at the French Open (2006) and a semifinal at Wimbledon (2004). He was also part of the Croatian team that won the Davis Cup trophy in 2005. Diminished by a recurring bout of mononucleosis and then back problems since 2007, Ančić eventually decided to retire from the sport to pursue a career as a lawyer. He played his last tournament in Munich in May 2010. Simon Aspelin (born 11 May 1974 in Saltsjöbaden, Sweden) turned professional in 1998, reaching his peak at doubles no. 7 in 2008. One-time runner-up at the Tennis Masters Cup (2007), Aspelin won 12 doubles titles, including one major at the US Open (2007, def. Dlouhý/Vízner) with Austrian Julian Knowle. Alongside fellow Swede Thomas Johansson Aspelin won the silver medal at the 2008 Beijing Olympics doubles event (lost to Federer/Wawrinka). He played his last tournament in Båstad in July. Marcos Daniel (born 4 July 1978 in Passo Fundo, Brazil) joined the circuit in 1997, reaching his career-high singles ranking of no. 56 in 2009. Daniel's success came mostly on the ATP Challenger Tour, where he collected 14 singles and eight doubles titles. He last competed on the main circuit in Estoril in April. Ashley Fisher (born 25 September 1975 in New South Wales, Australia) began his professional career in 1998, peaking at no. 19 in doubles in 2009. Fisher was a doubles semifinalist at the US Open (2006) – his best Grand Slam result, and collected four doubles titles on the main tour. He played his last event in Beijing in October. Gastón Gaudio (born 9 December 1978 in Temperley, Argentina) turned professional in 1996 and reached a career-high singles ranking of world no. 5 in 2005, making the