2005 McClune attempted to qualify for numerous USTA Pro Circuit events and, as a 15-year-old, received a wildcard to the qualifying round of the ATP event in Los Angeles, California.
2006 A breakout year for McClune on the USTA Pro Circuit – he reached the quarterfinals in
Baton Rouge, Louisiana and
Honolulu, Hawaii; the semifinals in
McAllen, Texas; and was a finalist in
Mansfield, Texas. He also received wildcards to the qualifying rounds of the ATP event in Los Angeles, California, and the
ATP Masters Series event in
Cincinnati, Ohio.
2007 McClune attempted to qualify for
ATP events in
San Jose, California;
Newport, Rhode Island; and Los Angeles, California. He received wildcards to
USTA Pro Circuit events in
Dallas, Texas and
Tallahassee, Florida, where he lost in the first rounds. In May, he received a wildcard to the USTA Pro Circuit event in
Carson, California where he reached the second round and lost to
Kei Nishikori of Japan. As a 17-year-old, he was seeded No. 1 at the USTA Boys National 18s Tennis Championships in
Kalamazoo, Michigan and won the title by defeating No. 3 seed Ryan Thacher, 6–1, 2–6, 6–4, 6–2. The win guaranteed him a wildcard into the main draw of the
2007 U.S. Open. He lost in the 1st round to the 20th seed
Juan Ignacio Chela 6–2, 6–1, 77–60. He reached the singles semifinals of the USTA Pro Circuit event in
Claremont, California and partnered with
Nikita Kryvonos to win the doubles title. He also reached the semifinal of the USTA Pro Circuit event in
Laguna Niguel, California, where he lost to Nikita Kryvonos. McClune won his first professional title at the USTA Pro Circuit event in
Costa Mesa, California, where he defeated Tim Smyczek in the final. A month later, McClune won his second pro title when he won the USTA Pro Circuit event in
Mansfield, Texas by defeating
Carsten Ball in the final. He followed that win with two quarterfinal showings at USTA Pro Circuit events in
Baton Rouge and
Nashville. In November, in the $50,000
Knoxville Challenger tournament in
Tennessee he lost to
Jesse Levine 6–4, 6–1, in the first round.
2008 McClune teamed up with
Kaes Van't Hof and got a wildcard entry into the
U.S. Open. They made it to the second round of the
doubles tournament, where they were heavily defeated by
Czech duo
Martin Damm and
Pavel Vízner. ==Personal==