Charles Leclerc set the fastest time in every practice session this weekend, but was denied pole position on Saturday afternoon by a stunning lap from Lando Norris.
The McLaren driver was the last of the challengers across the line, setting a new lap record at the historic track, the first lap ever to clock in at under 70 seconds.
Earlier on, Kimi Antonelli wrecked his first Formula 1 qualifying session in Monaco at the end of Q1, clipping the barriers and sending his Mercedes into the wall to bring out a late red flag.
Antonelli was on his final flying lap of the session, sitting just above the cut line in 15th at the time of the crash, with no chance to improve on that in Q2 as mechanics worked to fix his car.
Things went from bad to worse for Mercedes when Q2 started, with George Russell coming to a stop in the tunnel with an apparent electrical issue, red flagging the session once again.
A number of the 'expected' drivers dropped out alongside the Mercedes pair, but Yuki Tsunoda failed to make it through to Q3 once again.
The stewards are set to review a potential impeding incident between Max Verstappen and Lewis Hamilton after the session, the Dutchman calling Hamilton's actions 'massive impeding'.
Meanwhile, Lance Stroll looks likely to get a second penalty of the weekend after impeding Pierre Gasly coming out of the tunnel, having already been given a one-place grid drop for an incident in FP1.