Four unseeded players oust seeds in S.F. quarters

   Seedings meant nothing on an extraordinary day in the $100,000 San Francisco Open.
   An unseeded player beat a seed in every quarterfinal today in the indoor tournament at the Bay Club SF Tennis Center. Falling were No. 3 Michael Mmoh, No. 5 Bradley Klahn, No. 6 Noah Rubin and No. 7 Filip Peliwo.
   Miomir Kecmanovic, an 18-year-old Serb, outslugged Mmoh, a semifinalist last year at 19 years old, 7-6 (3), 6-7 (4), 6-1 in 2 hours, 38 minutes. The match featured an epic 53-point rally. Both players train in Bradenton, Fla.
   Germany's Dominik Koepfer, a former Tulane All-American, beat Southern California's Klahn, a 2012 Stanford graduate, 6-2, 7-6 (6) in a matchup of left-handers.
   Jason Jung, a Los Angeles-area native who plays for Taiwan, routed New York-area resident Rubin, the 2014 Wimbledon boys singles champion, 6-3, 6-1 in 52 minutes.
   And Dennis Novikov, a 24-year-old San Jose product, held off Canada's Peliwo, the 2012 Wimbledon boys singles champion, 7-5, 7-5.
   In Saturday's semifinals, the 215th-ranked Novikov will meet No. 285 Koepfer for the first time at 5:30 p.m., followed by No. 194 Kecmanovic vs. No. 205 Jung.
   Jung crushed Kecmanovic 6-1, 6-1 in 48 minutes last week in the quarterfinals of the $125,000 Dallas Challenger in their first meeting. Kecmanovic was coming off a 7-6 (4), 6-7 (5), 7-6 (4) victory over American Austin Krajicek, also in 2 hours, 38 minutes.
   Here are the San Francisco singles and doubles draws and Saturday's schedule.