Stan Wawrinka overcame a first-set scare to continue the defence of his French Open title with a 7-6 (9-7) 6-3 6-4 win over Taro Daniel.
The Swiss - who needed five sets to beat Lukas Rosol in his first match - was 6-4 down in an opening-set tie-break, but dug deep to turn things around and wrap up a spot in round three.
Wawrinka applied early pressure on Daniel - ranked 93rd - but spurned five break points across two games before having to save two in the fifth.
Daniel was beginning to prove more than a match for his fancied opponent in a series of long rallies, the American-born Japanese completing a love service game to underline his growing confidence.
It was another convincing hold that took the opener to a tie-break, where Daniel passed up two set points then pushed a volley long before Wawrinka sealed the set with an overhead smash.
Daniel - enjoying his best run at a grand slam just by being in the second round - failed to put up as much resistance in the second set as he was immediately broken, while an error-strewn service game at 3-5 put Wawrinka in control.
But if the world number four thought the job was done, Daniel provided a wake-up call by breaking to love at the start of the third set - Wawrinka's prior accuracy seemingly deserting him as he failed to find the mark on either wing.
It was a chink in Wawrinka's armour that the 31-year-old quickly compensated for, breaking back to tie it up at 4-4 with a pinpoint backhand down the line.
With one more hold and a break - sealed with a backhand - Wawrinka's work was done and he will meet Jeremy Chardy in the last 16.
Wawrinka  bt Daniel 7-6 (9-7) 6-3 6-4
Wawrinka - 62/40
Daniel - 21/19
Wawrinka - 12
Daniel - 7
BREAK POINTS WON
Wawrinka - 4/17
Daniel - 1/3
FIRST SERVE PERCENTAGE
Wawrinka - 63
Daniel - 63
PERCENTAGE POINTS WON ON FIRST/SECOND SERVE
Wawrinka - 81/62
Daniel - 65/53
Wawrinka - 116
Daniel - 98