World number two Novak Djokovic reached the Madrid Open third round by winning his first match since parting company with his coaching staff on Friday.
The 12-time Grand Slam champion beat Spanish wildcard Nicolas Almagro 6-1 4-6 7-5 to set up a tie with Feliciano Lopez or Gilles Simon.
Defending champion Djokovic, 29, described Friday's decision as "shock therapy", and will be on the tour alone until he appoints a new coach.
Rafael Nadal also plays on Wednesday.
The Spaniard takes on Fabio Fognini of Italy for the right to face Australia's Nick Kyrgios, who beat American Ryan Harrison 6-3 6-3.