SUMMARY: Another day with ne'er a dull moment in this terrific series, decorated by another landmark Steve Smith century and another barmy seven-over Bazball spell against the short ball when England threatened to self-destruct. By the end, though, it still felt England's day, with a calf injury to Nathan Lyon casting a long-term shadow over Australian hopes. Smith, on 85 overnight, went to another inevitable Test hundred with a glorious cover-driven four, but Australia may then feel they missed the chance of really strangling England's hopes, considering they'd been 3-316 on Wednesday. Their last five wickets tumbled for 77, with only Smith, eventually out for 110, Alex Carey (22) and skipper Pat Cummins (22no) edging them past 400. England started quite untroubled with a stand of 91 but after Zak Crawley was neatly stumped down leg by Carey off Lyon, all hell soon broke loose. Lyon's injury while trying to run in for a catch was followed by three key England batters - Ollie Pope (42), Ben Duckett and Joe Root (10) - falling into the short-ball trap, with the brilliant Duckett, in particular, surely cursing after his top-edged pull off Josh Hazlewood had him caught on the fine-leg boundary - agonisingly, on 98! The madness eventually subsided with Ben Stokes turning into Captain Sensible with a 57-ball 17 not out - but will Australia regret Marnus Labuschagne's square-leg spilling of Harry Brook, who, swatting the ball baseball-style, looks a menace on 45.
PLAYER OF THE MOMENT: Steve Smith appears to be in the mood to grace this series in the manner of 2019 after yet another immaculate Test ton, his 32nd, to bring him level with Steve Waugh as the second most prolific Australian centurion, just a day after he reached 9000 Test runs too. If that wasn't enough, two fine catches in the deep, including the difficult, ground-defying one scooped just above the turf that sent Root packing, completed his fine day.
KEY MOMENT: The sight of Lyon grimacing while being led around the boundary was desperately painful for Australia. He'll be out for the rest of this match, leaving his pace colleagues facing an extra workload, and, long-term, he's irreplaceable as a potential Ashes match-winner for the visitors.
STAT OF THE DAY: It appears Lyon's record-breaking sequence for a bowler of playing 100 consecutive Test matches may not go any further. The monumental nature of his achievement is illustrated by the fact the next longest sequence by any player is Kraigg Brathwaite's 75 straight Tests for West Indies - and he's a batter.
QUOTE OF THE DAY: "He's in his 100th consecutive Test match, which I know he was really looking forward to taking part in and having a role in as well. So fingers crossed he's OK, but it didn't look good." - a grim Smith summing up the thoughts of the entire Australian team after Lyon's injury.