US Clay Court Championships: Tiafoe books spot in last eight

Top seed Frances Tiafoe advanced to the quarter-finals of the US Clay Court Championships by beating wildcard Steve Johnson 6-2, 6-4 at River Oaks Country Club in Houston on Saturday.

Tiafoe, ranked No 15, will play Australian Jason Kubler, the No 6 seed, next.

In the previous round of the Houston Open, Johnson, ranked No 152, won against Argentinian Facundo Bagnis (7-6 (5), 1-6, 6-1).

Houston ATP250, other second-round results (River Oaks Country Club, clay, USD 642.735, most recent results first):

• Yannick Hanfmann vs. Tommy Paul
• Marcos Giron vs. Tomas Machac
• Tomas Martin Etcheverry vs. Max Purcell: saturday
• Cristian Garin vs. Zizou Bergs: saturday
• J.J. Wolf (5) beat Denis Kudla: 6-4, 6-1
• Gijs Brouwer beat John Isner (4): 6-4, 7-6 (4)
• Jason Kubler beat Daniel Elahi Galan: 6-4, 6-2