Sebastian Baez was the best junior on the planet before he was anything on tour — he reached World No. 1 in the ITF junior rankings in March 2018, reached the Roland Garros boys' final, and won boys' doubles gold at the Youth Olympics in his hometown of Buenos Aires. Mentored as a teenager by Juan Martín del Potro, the Argentine turned pro and tore through the Challenger circuit, becoming the youngest player to win five Challenger titles in a single season before breaking through at tour level.
Listed at 170 cm, Baez gives away height and power to nearly everyone he faces and answers with margin: heavy, looping topspin off both wings, elite court coverage, and the lung capacity to turn baseline exchanges into wars of attrition. It's a profile built for clay, where his ball kicks above strike zones and the longer rallies reward his legs. Fast hard courts remain the tougher ask — when opponents can shorten points, his lack of free serve points shows.
The clay is where the trophies live. Baez has stacked his ATP titles on the dirt, anchored by a home run at the IEB+ Argentina Open and deep weeks across the South American and European swings into events like the Rio Open and Chile Open. He climbed into the top 20 at his peak, the standard-bearer of an Argentine contingent that includes Francisco Cerundolo and Tomas Martin Etcheverry.
Currently ranked No. 56, Baez enters the heart of the 2026 clay season — the stretch through Madrid, Rome and Roland Garros — looking to defend the points that built his ranking and climb back toward the top 30 he's lived in before.