"On every surface. I think I am playing great events in all the surfaces since the beginning of the year".
Spaniard Muguruza, the third seed, will need to sharpen up though after enduring a awful start against 50th ranked teenager Ostapenko before the reigning French Open champion flicked the switch and won 2-6 6-2 6-1. But I am not going to do a calendar to try to be No. 1.
"I'm not sure. I talk to Wimbledon organisers, but apparently they are keeping that grand slam on grass and have refused to play that tournament on clay".
Since the start of the year, Murray has won just one of seven tournaments but Nadal is confident the Briton will be prepared for the French Open, which starts at the end of the month.
Bautista Agut could have gone 5-4 up in the second set after Djokovic appeared to send the ball long but the umpire said it was in. "But in general terms I am happy with the way that I played, obviously".
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Venus Williams, the 1999 champion, eliminated Lesia Tsurenko 6-4, 6-3.
Kerber of Germany joined Britain's Andy Murray, the top-ranked men's player, on the sidelines after Murray's loss to home favorite Fabio Fognini on Tuesday.
Thiem overcame American Sam Querrey in an absorbing three-set contest to maintain his brilliant recent run of results on clay. "I think he's watched Rafa and seen the awesome form Rafa's in, and realised he'd have no chance of beating him on a surface on which Rafa has always dominated him throughout the years", the Aussie told Tennis Mash, via Yahoo Sports.
Rafael Nadal's imperious return to clay-court dominance claimed another victim on Thursday, as he defeated Jack Sock 6-3 6-4 to reach the quarter-finals of Internazionali BNL d'Italia.
Garbine Muguruza has emerged as a favourite to win the title after beating Latvia's Jelena Ostapenko.
Sixth-seeded Halep beat Anastasia Pavlyuchenkova 6-1, 4-6, 6-0.