Reigning champions Bath put on a commanding second-half performance to fight back at Harlequins and begin their title defence with a bonus-point win. The hosts had made a blistering start to the match with flanker Will Evans scoring a hat-trick inside 30 minutes. Tom Dunn's reply meant the score was 12-7 when Chandler Cunningham-South was sent to the sin-bin on 33 minutes.