Frances Tiafoe outlasts Daniel Altmaier in first round at Stuttgart

Sixth-seeded Frances Tiafoe saved 7 of 9 break points and outlasted Germany's Daniel Altmaier 7-6 (3), 4-6, 6-4 to post a first-round victory at the BOSS Open Tuesday in Stuttgart, Germany.

Tiafoe had 24 winners and 30 unforced errors while prevailing on the grass surface after the end of the clay-court season. Altmaier had 15 aces among his 40 winners but committed 42 unforced errors.

Tiafoe next faces Australia's Rinky Hijikata, who rallied for a 6-7 (7), 7-6 (2), 6-3 victory over German wild card Tom Gentzsch. Australia's Nick Kyrgios beat the only other seeded player in action, prevailing 6-3, 6-4 over No. 8 Corentin Moutet of France.

The other winners Tuesday were Marcos Giron, Germany's Jan-Lennard Struff and Yannick Hanfmann, Australia's James Duckworth, France's Giovanni Mpetshi Perricard and Japan's Sho Shimabukuro.

Libema Open

Adrian Mannarino of France hit 25 winners while posting a 6-4, 3-6, 7-5 victory over defending champion Gabriel Diallo of Canada in ‘s-Hertogenbosch, Netherlands.

Mannarino ended a nine-match drought in singles play dating back to the Miami Open in mid-March. Diallo had 52 unforced errors against just 20 winners. Mannarino committed 44 miscues.

Martin Damm advanced with a 6-4, 6-4 victory over Spain's Jaume Munar. Also, China's Zhang Zhizhen registered a 7-6 (4), 5-7, 6-1 victory over Jenson Brooksby.

--Field Level Media