Sebastián Decoud (Spanish pronunciation: [seβasˈtjan deˈku];[1][2] born 18 September 1981) is a professional Argentine tennis player.

[3] Decoud began playing professionally in 2000, but he progressed very slowly as a pro player.

He had moderate success in Futures and Challenger tournaments, and got his ranking high enough to try qualifying at two ATP stops in July, but lost both matches.

After qualifying into the main draw, he took out #50 José Acasuso in the first round, but then lost to #112 Nicolás Lapentti.

But he came back strong in his next two matches, in the qualifying for the French Open, beating #124 Christophe Rochus and making his first Grand Slam main draw as a Lucky loser after losing in the final qualifying round.