Emil Ruusuvuori of Finland beat the Czech Republic's Jiri Lehecka 6-4, 6-4.
San Diego OpenIn a matchup of two American qualifiers, Mitchell Krueger took down Christopher Eubanks 6-4, 6-4 in the first round at San Diego.
Krueger, who will face Australian seventh seed James Duckworth in the second round, won a hefty 34 of his 39 first-service points (87.2 percent).
Japan's Taro Daniel dispatched American qualifier Emilio Nava 6-4, 6-3.
1 seed Daniel Evans of Great Britain in the next round.