Sinner has won the past two Grand Slams, triumphing on the US Open and Australian Open hard courts, and his merciless dismantling of Lehecka underlined his status as the man to beat.
The Italian controlled the action from the baseline and showed great athleticism as he moved around the court.
Sinner started on the front foot, making just one unforced error in a 23-minute first set.
Lehecka finally got on the board for 3-1 in the second set – and was greeted by huge cheers from the crowd on Court Suzanne Lenglen.
Lehecka, who remained in good spirits despite the scoreline, responded by smiling and raising both arms in the air in celebration.
It was a rare moment of joy for Lehecka, who only won two more games as Sinner continued his sprint towards the finish line, stamping his authority on the performance with an emphatic serve and volley on match point.
Elsewhere, third seed Alexander Zverev saw off unseeded Italian Flavio Cobolli in straight sets to reach the fourth round.
Last year’s finalist Zverev won 6-2 7-6 (7-4) 6-1 as he continues his bid for a maiden Grand Slam title.
Zverev will face unseeded Dutchman Tallon Griekspoor next after he beat American Ethan Quinn 4-6 6-1 6-7 (2-7) 6-1 6-4.
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