"Especially in a tournament like this, a tournament where I have had plenty of success in the past. but it happens, just one of those days". "Completely different conditions today".
Speaking on his victory over Nole, Kohlschreiber said, "I think I put out a pretty good strategy on the court, very clever serve, good return game - it was a good day". I wasn't playing well.
Elina Svitolina of the Ukraine came back from a break down in the third set to beat Australian Ashleigh Barty 7-6 (8), 5-7, 6-4 to reach the Indian Wells quarterfinals for the first time.
Djokovic and Fognini edged out doubles specialists Jean-Julien Rojer and Horia Tecau in a tight Indian Wells Masters quarter-final clash 7-6 (6) 2-6 10-6.
Djokovic was just 1 for 5 on break-point opportunities.
He made no mistake on his second chance, however, firing a sideline-skimming forehand to seal the milestone win on his first match point.
Williams will fight for a semi-final berth against eighth-seeded Angelique Kerber, who beat ninth-seeded Aryna Sabalenka of Belarus 6-1, 4-6, 6-4.
German Kohlschreiber stunned Djokovic 6-4 6-4 in the third round, sending the top seed tumbling out of a tournament he had won five times.
Her win over Halep, a former world No. 1 and victor at Indian Wells in 2015, comes after she dispatched 2018 finalist Daria Kasatkina in the second round and former French Open champion Jelena Ostapenko in the third. "I did a lot of things well", Nadal said.
"I was running too much and too defensive", the Romanian said to media.
Federer took his record to 22-3 over Wawrinka, a former world number three who is climbing back up the rankings in the wake of double knee surgery. "For me, the plan worked". I was focusing on my game.
He will play 19-year-old Canadian Denis Shapovalov, the 24th seed who beat 10th seeded Croatian Marin Cilic 6-4, 6-2.
He will play Serbia's Filip Krajinovic next after Krajinovic, ranked 113, beat 15th seed Daniil Medvedev 6-3 6-2.