Juan Martin del Potro is thisclose to earning his third tournament title of the season…

The 24-year-old Argentine professional tennis player defeated Gilles Muller of Luxembourg at the Erste Bank Open in Vienna, Austria, by a final score of 7-6 (4), 7-6 (5).

Playing in his fourth final of the year, del Potro – the tournament’s No. 1 seed – will now face qualifier Grega Zemlja in the final.

In his 17th career final, del Potro is looking for his 12th career title and his third title of the year after winning in Marseille and Estoril. He’s never played Zemlja before.

del Potro is playing his first tournament since returning from a wrist injury that sidelined him.

“Being in the final means a lot to me after a month without playing,” said del Potro. “I am getting better match by match. I am improving on my game, on my confidence. I am happy to play my second final in a row here.”

Del Potro said he was especially satisfied with his serve. He won all 38 service games this event, and in Wednesday’s second round, del Potro and Daniel Brands of Germany hit 30 and 32 aces respectively to set an all-time record for most aces in a best-of-three match.

His semifinal consisted mainly of short rallies and featured no breaks of serve. Del Potro converted his fourth match point with his 17th ace.

It’s his return that he needs to improve, said del Potro.

“Once again, I did not take my break point chances in this match so I will work on that,” he said. “I miss a lot of break points. Against this kind of player, one break point is like match point or set point.”