James O'Connor starred for Sale as they cruised to a big win over Bath, scoring a try and racking up 62 metres along the way.
Tatafu Polota-Nau had to surrender bragging rights to his former Waratahs teammate Will Skelton in a loss to Saracens.
The hooker came off the bench for the Tigers in the 61st minute, playing alongside 2015 World Cup teammate Matt Toomua and former Aussie 7s star Nick Malouf in the clash.
Toomua was playing his first game since October, after an injury setback interrupted his season.
Skelton played 57 minutes for ‘Sarries’ in the matchup.
Jono Lance’s Worcester had a big win over London Irish, with Saia Faingaa playing 58 minutes at hooker for the London side, along with fellow Aussie Ben Meehan.
James Horwill watched on as Harlequins went down to Newcastle in a one-point thriller.
Rob Horne had a tough outing on Sunday morning (AEDT), in his return from suspension, as Northampton went down to Exeter.
Horne faced off against a familiar face, with former Wallaby Greg Holmes coming off the bench for the Chiefs.
James Hanson and Gloucester returned to earth against Wasps, with their first defeat in six matches.
Leicester 17 - Saracens 29
Worcester 23 - London Irish 6
Newcastle 11 - Harlequins 10
Northampton 14 - Exeter 35
Sale 32 - Bath 9
Wasps 49 - Gloucester 24
Joe Tomane scored the match-sealer for Montpellier, playing at 12, as they cruised to a 38-17 win over Lyon.
Fellow Aussie Liam Gill kept Lyon in the game early, with a fourth-minute try before being replaced at half-time, while utility back Mike Harris had the reins at 10.
Former Wallabies skipper Ben Mowen was at six for Pau as they pulled off a tight win over Clermont, with Peter Betham coming off the bench for Clermont.
Racing 92 23 - Toulouse 19
Agen 27 - Brive 13
Bordeaux 29 - La Rochelle 19
Montpellier 38 - Lyon 17
Castres 28 - Stade Francais 6
Pau 22 - Clermont 21
Toulon 49 - Oyonnax 25
Backrower Sean McMahon made it two from two for Suntory, scoring the match-winner for Suntory against the Toshiba Brave Lupus, his second try in as many matches.
Matt Giteau steered the Sungoliath at flyhalf, as the competition heavyweights edged out Toshiba, with former Brumbies backrower Jordan Smiler in the locks and ex-Reds back Campbell Magnay at 12.
Anthony Faingaa played at 12 for Kintetsu in a win over the Red Sparks, while Adam Ashley-Cooper was at 13 when the Kobe Steelers suffered a tough Christmas Eve loss.
David Pocock sat out Panasonic’s big win over Yamaha, with Berrick Barnes starting at 10, playing just 27 minutes and Digby Ioane at 13.
Former Wallabies forward Peter Kimlin was sent to the bin, playing for Toyota Industries Shuttles in a tight win over the Sanix Blues, with Queenslander Sam Green contributing 10 of their 17 points.
NEC Green Rockets 13 - NTT Docomo Red Hurricanes 16
Ricoh Black Rams 40 - Canon Eagles 24
Suntory Sungoliath 28 - Toshiba Brave Lupus 24
Kubota Spears 23 - Ntt Docomo Shining Arcs 17
Kintetsu Liners 36 - Coca-Cola Red Sparks 20
Toyota Verblitz 39 - Kobelco Steelers 33
Yamaha 19 - Panasonic 44
Munakata Sanix Blues 15 - Toyota Industries Shuttles 17
Former Brumbies backrower Jarrad Butler scored a try for Connacht in a huge win over Ulster, the latter without playmaker Christian Lealiifano.
Edinburgh 18 - Glasgow 17
Connacht 44 - Ulster 16
Benetton 27 - Zebre 14