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Stefan Kostic
Stefan Kostic is a professional tennis player from Australia, 19 years old, currently outside the ATP top 500. In 2026 the record stands at 16-16 (16-16 at ITF / Futures level). Last match: lost to Aydin 7-6(1), ret. (ret.) in the Q1 at M15 Kursumlijska Banja, August 30, 2026.
16-162026 win–loss
The Climb
From the Futures to the Slams
The milestones that mark a professional career, with the ranking at each step.
Call the climb
Say where this player will be, and by when. Graded from the weekly rankings; the record lives on My Slip.
Why we're watching
Recent results
| Date | Tournament | Rd. | Opponent | Result |
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The last ten singles matches, from the results feed. Click a column header to sort.
Career record by surface
Ranking, recent weeks
Titles & finals
Win–loss by level · this season
| Level | Record |
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