STONE MOUNTAIN, Ga. — Oggie Kolev of Arkansas remained undefeated this year by winning his fifth match in four days on Monday and advancing at the Intercollegiate Tennis Association All-American Championships at Lincoln Tennis Center. Kolev beat David Lowenthal of Wake Forest, 4-6, 6-1, 6-2, and will play again on Tuesday. “He played well,” head coach Robert Cox said. “The conditions were tough. It was cool and windy, but he hung in there. He’s won five tough matches.” Kolev is one of eight players fighting for a spot in the main draw of the tournament. The qualifying began on Friday with a field of 256 players. Over the weekend, Kolev advanced with wins over Duke’s Peter Shults, 6-2, 6-3; Tulsa’s Sean Monk, 6-2, 6-2; Texas Tech’s Royce Ramey, 6-3, 6-3; and North Carolina’s Nicholas Monroe, 6-3, 6-1. Kolev is 8-0 for the Razorbacks. He went 3-0 in his first tournament, the Ninth Annual Tulsa Hurricane Tennis Invitational Sept. 28-30. Kolev was 26-12 last year, helping Arkansas go 16-10, reach the second round of the NCAA Tournament and finish the year ranked No. 25 by the ITA. Aleksey Bubis reached the third round of the tournament, and Eduardo Pacheco and Oscar Ohlsson each won their opening match before being eliminated. Tiago Azevedo and Nathan Price were knocked out in the first round.