Toulouse, Saracens, and Racin 92 are all 3-0 after Round 3 of the Heineken Champions Cup, with Racing in the best position to clinch a place in the Quarterfinals.
Racing dismissed Leicester 36-26 and has a nice cushion atop Pool 4 event after Ulster edged Scarlets 25-24.
The opening moments of the second 40 minutes were marred by what appeared to be a serious neck injury to Racing prop Eddy Ben Arous who was taken to the hospital for scans after a collision with Tigers front-rower Ellis Genge.
Tigers interim head coach Geordan Murphy bemoaned his side's poor penalty count.
"We had 20 minutes with 14 men and that hurts," he said. "It was hugely disappointing we were at the wrong end of the penalty count in Europe. We have the best disciplinary record in the Premiership. We have to work on that."
Scotland flyhalf Finn Russell was at his influential best throughout the 80 minutes asking questions of the Tigers' defense every time he had the ball in his hands.
France threequarter Virimi Vakatawa opened the scoring within the opening 10 minutes, crashing over after Tuilagi had been shown a yellow card for cynically knocking a Russell pass down. It was Vakatawa's ninth try in 10 matches this season.
Saracens hammered Cardiff behind a strong performance from Mako Vunipola, back from injury.
“It’s never nice to miss games and as a player we love to play," said Vunipola. "My family are happy I’m back here as I’m not moaning so much. We have good leaders in this group and they spoke well and we knew exactly what we needed to do. Ben Earl made a big impact in the second half.”
Toulouse just got by Wasps 24-16 in Coventry, and playing at home next week should be in good position.
Who made a move? Edinburgh's 31-13 defeat of Newcastle made it a tight fight in Pool 5. Gloucester did well to keep pace with Munster with a win over Exeter. Leinster's close win over Bath basically eliminated Bath as a threat in Pool 1.