He tapped in after Joao Cancelo's shot was blocked - having earlier hit the post with a header.
The Croatian boss replaced Davide Ballardini before the global break for his third spell in charge of Genoa and he made an immediate impact as the Italian champions failed to record a victory for the first time in nine league games this season.
Ronaldo made history with Saturday's score, becoming the first player to ever score 400 goals in Europe's top five leagues.
Lionel Messi is next best on 389.
Juve paid heavily for failing to kill off the encounter when Bessa headed a cross from Christian Kouame into the back of the net on 67 minutes.
Dodgers even NLCS on Bellinger's 13th-inning hit
The veteran right-hander goes for Milwaukee in Game 7. "It's just a classic case of he executed a lot of pitches", Counsell said. But, the Dodgers went with it and all they could do was hope Urias would not need to be used in an extraneous situation.
The result gives Napoli the chance to close to within four points of Juve at the top of the table and sees their 11-game winning run in all competitive competitions come to an end just three days before they face Manchester United in the Champions League.
Alexis Sanchez unexpectedly missed Manchester United's final training session before their Champions League clash with Juventus.
Meanwhile, Roma's troubles grew with a 2-0 home defeat by lowly SPAL, who finished the game with 10 men but looked comfortable all the same.
The attacker moved to United in 2003 and was a part of the team that was dumped out of the Champions League by Mourinho's Porto in the last 16 - the coach doing little to endear himself to the Old Trafford faithful with his victorious charge down the touchline during a 1-1 draw in England after Costinha's crucial equaliser.
SPAL took the lead from the penalty spot after 38 minutes.