Ryan Haviland, a former Stanford All-American, defeated Paul Oosterbaan of Kalamazoo, Mich., 5-7, 6-2, 6-3 in a matchup of unseeded players on Saturday to reach the final of the $25,000 Tulsa (Okla.) Pro Championships.
Haviland, 35, launched a comeback last year after missing 11 years because of eight knee surgeries and one elbow operation over six years. He founded the Haviland Tennis Academy in Greenville, S.C., in 2014.
Oosterbaan, 6-foot-7 (2.0 meters), recently finished his sophomore season at the University of Georgia. His father, JP, was a member of the University of Michigan's 1989 NCAA championship basketball team.
Haviland will seek his first professional singles title today against unseeded Cameron Norrie of Great Britain.
Norrie, a singles semifinalist in last month's NCAA Championships in Tulsa as a Texas Christian sophomore, beat third-seeded Tennys Sandgren of Wesley Chapel, Fla., 6-2, 1-0, retired.
Sandgren played for the Sacramento-based California Dream in its inaugural World TeamTennis season last July. The Dream folded in January.
Norrie also knocked off 6-foot-11 (2.11-meter) Reilly Opelka, last year's Wimbledon boys champion, in the first round, sixth-seeded Clay Thompson in the second round and top-seeded Mitchell Krueger in the quarterfinals.
Haviland ousted eighth-seeded Takanyi Garanganga of Zimbabwe in the first round and fourth-seeded Michael Mmoh, one of the United States' top prospects, in the quarterfnals.
All five of Norrie's opponents in the tournament are American.