Great Britain's Cameron Norrie suffered a gruelling three-set defeat against American Reilly Opelka to exit the Dallas Open in the last 16.

British number two Norrie, 29, lost 4-6 7-6 (7-5) 6-4 in a match that lasted two and a half hours.

There was little between the pair, with both winning 71% of their points on serve and sharing the 202 points played equally.

Wildcard Opelka found the edge though - recovering from a set down to win a second-set tie-break before breaking in the third game of the final set.

Norrie held his serve after that but was unable to recover the break.