6 instances over the last decade when more than 20 wickets fell in a single day of a Test

#4 Sri Lanka vs Australia, 2nd Test, Galle, 2016

Sri Lankan spinners wrecked havoc on the 2^nd day against Australia

Australia came into the second match of the series after having suffered a shock defeat in the first match, but their woes against spin continued as they caved in once again to Sri Lanka's spinners in their first innings.

Rangana Herath claimed a hat-trick and 21 wickets had fallen in the day, as Australia collapsed for 106 runs, which is their lowest ever Test score against Sri Lanka.

The second day started with Australia resuming at 54 runs for 2 wickets when tragedy struck and they were left fumbling for answers against the spin of Dilruwan Perera and Rangana Herath, and were shot out for a paltry 106 runs, and handed Sri Lanka a lead of 175 runs.

Sri Lanka started their second innings in a positive vein and piled on the runs and when they were eventually dismissed for 237 runs, the lead had swelled to 412 runs.

Chasing the humongous target of 413, Australia were reduced to 25/3 by the end of the day's play.

All in all, 33 wickets have fallen in the first two days, which is the most number of wickets to have fallen in Sri Lanka.