Jannick Sinner has put an end to a four-match summer slump which sapped the confidence of the No. 24, who is into the semi-finals of the ATP Washington event.

The teenager who turns 20 in just over a week will face off against American wild card Jenson Brooksby, who has knocked out second seed Felix Auger-Aliassime and No. 16 Frances Tiafoe so far this week in the US capital.

Brooksby has made himself known already by reaching last month’s Newport final on grass against two-time Grand Slam finalist Kevin Anderson.

Sinner has managed to tweak his game enough to start winning again, with the Italian suggesting that a minor modification in his serve might have been key.

“To be honest, I’ve worked very hard,” he said. “Not only on a small change in the service, but also in the physical part. 

“These are not things that pay  off quickly – they take time and games.

“But winning three consecutive matches is extremely important, especially for the following events (and the US Open starting at the end of the month).”

Most of Sinner’s problems came during the brief grass season: “First of all it was not easy to play on grass, where I don’t have much experience. 

“I was leading on the scoreboard in Queen’s (against Brit jack Draper) and I ended up losing.

“At Wimbledon I had my chances (against Marton Fucsovics). The same same thing happened to me last week in Atlanta with three set points that I couldn’t take advantage of (against Australian Chris O’Connel),”

The run of poor form started for Sinner at Roland Garros, where he reached the fourth round but could not match it with Rafael Nadal.

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