Sam Kerr and Caitlin Foord were on the scoresheet in back-to-back UEFA Women's Champions League games, with both leading their team to wins in the group stage.
Kerr has netted four goals in four games for Chelsea, helping the Blues to go three points clear at the top of Group A. While Arsenal picked up their third win in a row to remain in second place.
Group A
After Chelsea picked up a dominant 7-0 win over Swiss side Servette FC Chênois last week, Emma Hayes' side was looking to repeat the same dose when they hosted them.
Last week's game saw the Blues score six goals in just 38 minutes, however, they wouldn't have the same outcome this time around.
Hayes opted to change some usual starters, opting for the front duo of Sam Kerr and Beth England.
Kerr scored the lone goal in the encounter, with the dynamic duo of Kerr and Kirby linking up once again.
With the other game in group A seeing a shock upset to Wolfsburg, Chelsea goes three points clear at the top of the group.
Chelsea's next game will see them host Italian side Juventus, who are in fine form after beating Wolfsburg 2-0 and sit in second place in the group.
Chelsea v Juventus
Date: Thursday, December 9
Kick-off: 7:00 am AEDT
Group C
Caitlin Foord and Lydia Williams both made the start for Arsenal as they faced UWCL first-timers HB Køge for the second week in a row.
After a 5-1 showing last week this fixture promised goals galore, Foord opened the scoring just 15 minutes into the encounter. Beth Mead placed a perfect cross to find an onrushing Foord who made no mistake from right in front of the goal.
Mead would have the ball in the back of the net just before the halftime break before a questionable offside call ruled out Arsenal's second.
Arsenal struggled to link up in front of goal and it seemed HB Køge would find the equaliser at the 75-minute mark before Williams was able to make the one-on-one save to keep the Danish side goalless.
Lotte Wubben-Moy would finally find the Gunners second of the evening with a pinpoint header from a corner.
Vivianne Miedema would have the third for the game and wrap up all three points, with Steph Catley placing a perfectly weighted through ball into the path of Miedema.
Arsenal will now host reigning UWCL champions FC Barcelona in their next match.
Arsenal v FC Barcelona
Date: Friday, December 10
Kick-off: 7:00 am AEDT
Group D
Ellie Carpenter's Lyon faced their first loss of the competitive season across all competitions, going down 1-0 to Bayern Munich.
Carpenter made the start for Sonia Bompastor's side, with Bompastor opting to start Ada Hegerberg over Melvine Malard.
Lyon had an early scare when keeper Christiane Endler left an open net for Bayern to aim at, however, Klara Bühl's attempt from outside the box was just wide.
Bayern would find the opener just before the 70th minute and it was a familiar foe on the end of things, with former Lyon defender Saki Kumagai scoring the winner against her old club.
Lyon threw everybody up for their final corner of the match but Bayern stood firm and denied a last-minute equaliser.
Lyon still remains in first place in Group D with nine points to Bayern's seven. The French side now takes on Benfica in their next UWCL game.
Benfica v Lyon
Date: Friday, December 10
Kick-off: 7:00 am AEDT
The other Group D fixture saw Dylan Holmes' BK Häcken host Benfica. After clinching a late winner last week Häcken were looking to make it two wins in a row.
The away side opened the scoring just three minutes into the encounter through Canadian Cloé Lacasse, scoring Benfica's first goal in the UWCL group stage.
Häcken would then get the chance to even things up from the spot, with Elin Rubensson scoring her second penalty kick in a row for the Swedish side.
In a cruel turn of events, Benfica clinched the win in the 91st minute through Catarina Amado to seal Benfica's first win of the group stage.
Holmes was an unused substitute on the bench. Häcken now look to bounce back when they host Bayern Munich.
Häcken v Bayern Munich
Date: Friday, December 10
Kick-off: 4:45 am AEDT