Fourth-seeded Milos Raonic hit 17 aces and as he beat Spaniard Pablo Carreno Busta 7-6 (5) 6-4 to reach the third round of the Paris Masters.

Earlier, world No.11 Tomas Berdych defeated Joao Sousa 6-3 3-6 7-5.

Berdych is hopeful that working with coach Goran Ivanisevic – the big-serving Croat who won Wimbledon in 2001 – will help improve his game.

“I like his approach and how he tries to simplify things for me,” the 31-year-old Berdych said.

“Hopefully I can get to the point where I can start to use his experience in all the big matches he’s played.”

Berdych, the 2005 Paris Masters champion, will next face either 10th-seeded Roberto Bautista Agut or Gilles Simon.

Seven players are vying for the two remaining spots in London.

Dominic Thiem and Marin Cilic, who won the Swiss Indoors on Sunday, held the last two places before this week. David Goffin, Jo-Wilfried Tsonga, Lucas Pouille and Bautista Agut are the other contenders playing in Paris.

John Isner had 14 aces as he reached the second round by beating Mischa Zverev 7-6 (8) 6-4.

Isner will next play 15th-seeded David Ferrer, who has beaten the big-serving American seven times in eight meetings.

Jack Sock; Feliciano Lopez; Nicolas Mahut; Viktor Troicki, Ivo Karlovic and Gilles Muller all advanced to the second round.

Muller faces Novak Djokovic on Wednesday.