Thiem into semis in Buenos Aires, Isner cruises in New York

Dominic Thiem remained unbeaten at the Argentina Open, defeating Pablo Cuevas to reach the semi-finals.

Dominic Thiem will face Diego Schwartzman in the last four.   -  Getty Images

Dominic Thiem was tested before reaching the Argentina Open semifinals, while John Isner cruised through in New York.

A two-time champion in Buenos Aires, Thiem overcame Pablo Cuevas 4-6, 6-4, 6-3 in their quarterfinal on Friday.

The top seed improved to 11-0 at the ATP 250 event, where Diego Schwartzman awaits in the last four.

The fourth-seeded Schwartzman was too good for Albert Ramos-Vinolas in a 6-1, 7-5 victory.

The other semifinal will see Italian third seed Marco Cecchinato meet Guido Pella.

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Cecchinato got past Roberto Carballes Baena 7-6 (7-3), 6-4, while Pella saved four match points in a 6-7 (3-7), 7-6 (11-9), 6-1 win over Jaume Munar.

At the New York Open, Isner served 16 aces in a 6-4, 6-1 win over Australian seventh seed Jordan Thompson.

He will face fellow big-serving American Reilly Opelka in the semifinals after the 21-year-old beat Guillermo Garcia-Lopez 6-3, 6-4.

Last year's runner-up Sam Querrey overcame Jason Jung 6-3, 3-6, 6-3 and next meets Canadian qualifier Brayden Schnur, who edged Paolo Lorenzi 6-7 (7-9), 7-6 (7-5), 7-5.

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