The sixth-seeded Federico Delbonis of Argentina edged Canadian qualifier Filip Peliwo 6-2, 6-7 (5), 6-4 Wednesday to reach the quarterfinals of the Grand Prix Hassan II.
Delbonis, who won the Brazil Open last month, won six straight games to take the first set and lead 2-0 in the second. But Peliwo, the 2012 world junior champion, fought back to force a tiebreaker and leveled at one set apiece. In the third, Delbonis earned the decisive break at 4-4.
Also, Aleksandr Nedovyesov of Kazakhstan and Jiri Vesely of the Czech Republic advanced to the second round.
Vesely defeated Leonardo Mayer of Argentina 6-4, 6-3, and Nedovyesov earned his first victory on the main tour by rallying from a 5-2 deficit in the opening set to stun the seventh-seeded Robin Haase of the Netherlands 7-6 (6), 6-4.
The Spanish trio of Guillermo Garcia-Lopez, Albert Montanes and Pablo Carreno Busta of Spain also won their first-round matches.
The eighth-seeded Garcia-Lopez beat Mikhail Kukushkin of Kazakhstan 7-6 (5), 7-6 (6) despite making seven double faults.
Named most improved player of the year by the ATP for climbing from 715th to 65th in the rankings last season, Carreno Busta cruised past Tobias Kamke of Germany 6-1, 6-2. The Spaniard broke Kamke twice in each set and did not face any break point.
Montanes saved all four break points he faced in his 6-2, 6-3 win over Kenny de Schepper of France.