NEW YORK — Sam Querrey was about as perfect as can be en route to becoming the first American man in the U.S. Open quarterfinals since 2011. Querrey never faced a break point and wound up with 55 winners and only eight unforced errors while easily beating 23rd-seeded Mischa Zverev of Germany 6-2, 6-2, 6-1 on Sunday night. “I thought I played really well.