Novak Djokovic breezed through to the second round of the Astana Open with a straight-set win over Cristian Garin.
Djokovic will play Dutchman Botic van de Zandschulp in the last 16.
Marin Cilic, who was beaten by Djokovic in the Tel Aviv Open final on Sunday, is also through to the second round after coming from a set down to beat Germany's Oscar Otte5-7 7-6 (7-4) 6-2.
Third seed Stefanos Tsitsipas is already through to the quarter-finals after beating Italy's Luca Nardi 7-6 (7-2) 7-6 (7-3) in the second round.