Lu was hurt late in the third set Wednesday in his 7-6 (1), 1-6, 7-5 quarterfinal victory over South Korea's Hyeon Chung at the Wake Forest Tennis Center. Johnson reached his third career semifinal and second this season. The two-time NCAA champion at South California made his last semifinal appearance three weeks ago in Washington. In the night session, second-seeded Kevin Anderson of South Africa faced eighth-seeded Borna Coric of Croatia, and sixth-seeded Thomaz Bellucci of Brazil played Malek Jaziri of Tunisia.