INTERNATIONAL NEWS - Murray has won 20 consecutive matches ahead of the US Open, the final Grand Slam of 2016 which starts on 29 August.
The Scot will play Bernard Tomic next after the Australian beat Japan's Kei Nishikori 7-6 (7-1) 7-6 (7-5).
In the women's draw, Murray's fellow Briton Johanna Konta lost 6-7 (1-7) 6-4 6-0 to fifth seed Agnieszka Radwanska.
Germany's Angelique Kerber reached the last eight with a 7-6 (7-5) 6-4 victory over Barbora Strycova and will play Carla Suarez Navarro.
Kerber will replace Serena Williams as world number one if she wins the Cincinnati title. Williams missed the tournament with a shoulder injury,
