Eight-time victor Roger Federer, 36, plays German Jan-Lennard Struff last on Centre in round three.
Raonic reached the third round for a sixth straight year, having lost to eventual champion Roger Federer in last year's quarter-finals.
Federer's quest for a ninth Wimbledon crown gained momentum with a flawless 6-4 6-4 6-1 win over Slovakian world No 73 Lacko in 89 minutes.
That match was briefly interrupted by a swarm of flying ants. "I think that's been helpful, too", he said.
But where Pouille failed, his compatriot Gael Monfils succeeded in a 3-6 6-3 7-6 (7-5) 7-6 (7-3) triumph over Italian Paolo Lorenzi.
Swiss Stan Wawrinka suffered a shock 7-6 (7) 6-3 7-6 (6) defeat by world number 133 Thomas Fabbiano in a match that resumed on Thursday after rain halted play on Wednesday. I had the response to her game, but she's a very tricky opponent, very talented, and in really good confidence.
Centre Court was treated to another display of sensational serving and genius groundstrokes as Federer outmatched Lacko with some of his finest work.
The 2004 champion Sharapova was cruising to victory at one stage on Court Two with a set and 5-2 lead before qualifier Diatchenko shrugged off a back injury to win 6-7 (3), 7-6 (3), 6-4 after more than three hours of tense action.
A key tactical shift is that Federer is mixing things up very well in comparison to Halle and Stuttgart, where he was more prone to hitting flat or topspin shots.
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Struff, quoted in German Bild, said: "I played a good match against Federer in Melbourne".
"On certain days it goes better than others", Federer said.
The top seed belted down 16 aces, hit the target with 70 percent of his first serves, dropped only three points on his first serve and did not even come close to facing a break point.
Dutchwoman Kiki Bertens is also through with a 6-4, 6-0 result against Russian Anna Blinkova, but Poland's Agnieszka Radwanska is out following a 7-5, 6-4 loss to Czech Lucie Safarova.
Serena Williams powered to her 16th successive win at Wimbledon as the seven-time champion routed Bulgarian qualifier Viktoriya Tomova 6-1, 6-4 on Wednesday.
"I haven't played her in a while".
Sam Querrey, the 11th seed, stepped up his bid to emulate last year's run to the semi-finals with a 7-6 (7-4) 6-3 6-3 win against Ukraine's Sergiy Stakhovsky. Romanian 29th seed Mihaela Buzarnescu thrashed British teenager Katie Swan, 6-0, 6-3 to extend her remarkable renaissance.
Canada's Milos Raonic survived a tough test against Australian John Millman elsewhere in the men's singles draw.