Wawrinka at his best in Paris since surgery in 2017

Tennis - French Open - Roland Garros, Paris, France - June 1, 2019. Switzerland's Stan Wawrinka reacts after winning his third round match against Bulgaria's Grigor Dimitrov. REUTERS/Benoit Tessier

PARIS (Reuters) - Stan Wawrinka believes he is playing his best tennis since undergoing surgery on his knee but said it was premature to start thinking about winning a second French Open title after beating Grigor Dimitrov in the third round.

The 24th-seeded Wawrinka won three straight tiebreaks to beat Dimitrov 7-6(5) 7-6(4) 7-6(8) in the 'Bullring' in Paris, and said he took heart from being able to "increase my tennis in the right moments."