Verdasco, Querrey through in Houston
Spaniard Fernando Verdasco came through his opening round at the US Men's Clay Court Championship as two seeds fell.
Verdasco proved too good for Carlos Berlocq in a 6-4 6-3 victory on the clay courts in Houston on Tuesday.
The 2014 champion had to recover from being 3-1 down in both sets to secure his win.
Querrey, runner-up last year, served eight aces in his 6-4 7-6 (7-4) win over teenage lucky loser Reilly Opelka.
However, two seeds made way.
Steve Johnson went down to fellow American Donald Young 6-4 6-3 and Paolo Lorenzi was beaten by Tommy Paul 6-2 6-3.
Cypriot seventh seed Marcos Baghdatis needed just 49 minutes to get beyond the first round, thrashing Diego Schwartzman 6-0 6-0.
Wildcard Tim Smyczek battled through with a 4-6 7-6 (7-5) 6-4 win over Nicolas Kicker and Matthew Barton overcame Frances Tiafoe 6-3 6-4.
Lukas Lacko also progressed, beating Dmitry Tursunov 6-1 7-5, and Benjamin Becker overcame German countryman Michael Berrer 7-6 (8-6) 6-0.