Top seed at a tour-level event for the first time, Jiri Lehecka coped with the pressure on Thursday when he defeated former World No. 3 Dominic Thiem 6-3, 7-5 at the Plava Laguna Croatia Open Umag. Stan Wawrinka, the 2006 champion, also advanced later in the day.
The Czech Lehecka won 82 per cent (31/38) of his first-serve points in his maiden meeting against Thiem, and rallied from a break down in the second set to advance after one hour and 41 minutes.
The 21-year-old, who is making his debut in Umag, will next play seventh seed Matteo Arnaldi in the quarter-finals. Lehecka and Arnaldi both competed at the 2022 Next Gen ATP Finals in Milan, where the Czech defeated the Italian en route to the final.
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Lehecka has used that result as a springboard this season, highlighted by his run to the quarter-finals at the Australian Open and fourth round at Wimbledon. The World No. 33’s best result on clay prior to this week was a third-round appearance at the ATP Masters 1000 event in Monte-Carlo.
Lehecka is seeking his maiden tour-level title this week at the ATP 250 clay-court event. The 2015 Umag champion Thiem was aiming to reach his third tour-level quarter-final of the season. The Austrian leaves Croatia 9-17 on the season.
Wawrinka, who won his first ATP Tour title in Umag 17 years ago, surged past Argentine Federico Coria 7-5, 6-1 to earn his spot in the last eight. The former World No. 3 will next face Roberto Carballes Baena, who eliminated Taro Daniel 6-3, 6-1.
Wawrinka earned five service breaks against Coria, notably winning 56 per cent of his first-serve return points. The Swiss is competing in Umag for the first time since 2007.
Jaume Munar also advanced, defeating Fabian Marozsan 6-4, 6-3. The Spaniard will next meet second seed Lorenzo Sonego after the Italian overcame Marco Cecchinato 6-1, 7-6(7).
Sonego saved one set point in the second-set tie-break before triumphing after one hour and 37 minutes. The 28-year-old’s best result on clay this season came at Roland Garros, where he advanced to the fourth round.