World number one Roger Federer equalled his best start to a season when he beat South Korea's Chung Hyeon to reach the Indian Wells Masters semi-final.
The defending champion claimed his 16th victory of 2018 with a 7-5 6-1 win over the world number 26 in California.
The Swiss has matched the start he made to the 2006 season, where he went on to win 33 of his first 34 matches.
He faces Borna Coric in the last four after the Croat beat South Africa's Kevin Anderson 2-6 6-4 7-6 (7-3).
Federer, searching for a record sixth title, broke Chung's serve four times as he won in one hour 23 minutes.