Kevin Anderson of South Africa reached the quarterfinals of the Grand Prix Hassan II by defeating Spanish qualifier Pablo Carreno-Busta 6-3, 6-3 on Thursday.
The second-seeded Anderson will play Grega Zemlja of Slovenia, who beat Swiss qualifier Henri Laaksonen 7-6 (5), 6-1.
Anderson won six straight games to win the first set and took a 4-0 in the second. He lost just a point on serve in the first set.
Carreno-Busta, who won seven futures titles, knocked out defending champion Pablo Andujar in the first round at Casablanca.
He broke Anderson's serve in the fifth game of the second set, but Anderson later converted his second match point with a forehand winner.
Zemlja saved four set points to force a tiebreaker. The eighth-seeded Slovenian took a 5-0 in the second and won with a forehand winner.