Tsonga got an early break in the third game of the first set and after he took Harrison’s serve once more to go 5-2 up, he clinched the first set with his own serve.
The second set was a much more even contest. The Frenchman had a tripple break point opportunity to take a 2-1 lead, but Harrison held and the set went with serve until the tiebreak. Tsonga showed some fair play as he corrected the umpire’s call, but still dominated the breaker and went on to win the match.
Tsonga will next play 6th seed Berdych, who overcame Kevin Anderson of South Africa in yesterday’s second round match, winning 6-4 6-3.
5th seed David Ferrer joined Tsonga in the third round after beating Radek Stepanek of Czech Republic 7-6 (4) 6-2.
The Spaniard’s this year’s record on clay is 17 wins and 2 losses and he will now face Croatian Marin Cilic, who dismissed American John Isner 7-6 (4) 7-6 (3).
Also through to the next round is 7th seed Janko Tipsarevic of Serbia, who eliminated the Argentine qualifier Federico Delbonis 7-6 (5) 6-7 (6) 6-3.