Canberra teenager Nick Kyrgios' strong injury comeback has continued after he advanced into the Sarasota Open final with a come-from-behind semi win over Daniel Kosakowski on Sunday.
Kyrgios recovered from losing the first set to the American to claim the match 4-6 6-3 6-4.
The world No. 221 was in trouble down 4-1 in the deciding set, but won the last five games of the match.
Kyrgios, who turns 19 this Sunday, has watched his ranking drop more than 60 places after sitting out the past six weeks with an elbow injury.
It stalled his progress after he beat Germany's Benjamin Becker in the first round of January's Australian Open, before cramping ended his hopes in losing in five sets to French world No. 28 Frenchman Benoit Paire in round two.
He is hoping to perform well enough to earn a start at the French Open and Wimbledon.
''Honestly, I don’t know how I won that match,'' Kyrgios told the Sarasota Herald-Tribune.
''He got a bit nervous, didn’t take chances and didn’t close out the match.''
Kyrgios won three of his break points in the match, which proved crucial.
He will play Serbia's Filip Krajinovic in the final of the $US100,000 US Tennis Association pro circuit event.
Kyrgios and Krajinovic, ranked No. 204, have never played each other.
''If I serve well and play well, I have a pretty good chance to win,'' Kyrgios said.
Krajinovic, 22, also bounced back from a set down to beat Austria's Gerald Melzer 3-6, 6-3, 6-1.