Roman Borvanov defeated Ti Chen 6-2 6-3 in the San Jose qualifying round on hard. The upset overturned the form book — Ti Chen came in leading the head-to-head 1–0. Roman Borvanov claimed a first win over Ti Chen in two meetings, levelling the head-to-head at 1–1.
Borvanov R. took it in straight sets.
Roman Borvanov beat Ti Chen 6-2 6-3. Umpiry, "Roman Borvanov vs Ti Chen — San Jose Qualifying Round", https://umpiry.com/match/2011-02-06/borvanov-vs-chen-san-jose-qf?utm_source=cite (as of 6 February 2011).