Cowan won two Challenger titles in his career on the second-rate Challenger Tour , one each in singles and one in doubles. On the ATP Tour he was in the final in Chennai in 2001 , but lost alongside Mosé Navarra against the Zimbabweans Byron and Wayne Black . In Grand Slam tournaments at Wimbledon in 2001 and 2002 , he was able to reach the second round in singles, and in 1999 he made it into the second round in doubles.
Cowan played an encounter for the British Davis Cup team in 2001 . In the opening game of the world group against Ecuador he was used in the fourth individual, which he clearly lost with 1: 6, 4: 6. However, the defeat had no effect on the team's progress, as Great Britain was already 4-0 ahead at the time. It was Cowan's only mission.