India's number one Singles Tennis player Somdev Devvarman recorded his biggest win of career yesterday as he defeated World Number 5 Juan Martin Del Potro in Dubai Tennis Championship. World number 78 Somdev, won the first set by 7-6, later Del Potro conceded match due to pain in his left wrist. This was Somdev's first victory over a top ranked player. In next round he face's lower ranked Tunisias' Malik Jaziri.