Thiem, Tomic through to semi-finals in Mexico

Dominic Thiem moved into the semi-finals of the Abierto Mexicano Telcel with a straight-sets victory over Grigor Dimitrov. 

Austrian fourth seed Thiem ousted Dimitrov 7-5 6-2 after more than one-and-a-half hours in Acapulco on Thursday.

Thiem converted four of 10 break points against the seventh seed on the hard-courts at the ATP 500 event.

The final four will see Thiem meet American Sam Querrey.

Querrey battled from a set down to complete a 2-6 6-4 6-4 victory over countryman Taylor Fritz.

The Delray Beach Open winner hit 14 aces on his way to victory.

Australian Bernard Tomic advanced to the semi-finals courtesy of a straight-sets triumph against Illya Marchenko.

Tomic - the fifth seed - converted five of six break points and saved three of his own to secure a 7-5 7-5 win over his Ukrainian opponent.

Tomic will face Marchenko's countryman Alexandr Dolgopolov for a spot in the final.

Dolgopolov was rarely troubled by Robin Haase, firing down nine aces on his way to a 6-3 6-3 victory.