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Arsenal finished the game a man down when Merino was shown a second yellow card, but the Reds could not capitalise.
Nothing he could have done about Merino turning in the rebound, or Martinelli's opener.
Conor Bradley: 6 (Alexander-Arnold, 67)
Blitzed Martinelli for pace and got a low cross in which Diaz should have scored from, and made an excellent sliding block on Martinelli in the second half.
Played a great ball through to Bradley which created a big chance for Diaz.
Virgil van Dijk: 6
Uncharacteristically quiet game for the skipper.
Andrew Robertson: 8
Created a clear opening for Gakpo with a precise ball over the top.
Also got stuck into Bukayo Saka during their one-on-one battle.
Ryan Gravenberch: 6 (Elliott, 83)
Some steady dribbling and passing but not as influential as he could have been.
Curtis Jones: 6 (Mac Allister, 67)
Played an excellent outside-of-the-boot pass to Mohamed Salah which created a big chance for Diaz.
Set up multiple chances for Diaz and sent a beauty over the top for Dominik Szoboszlai which led directly to Liverpool's second goal of the game.
Dominik Szoboszlai: 7
Superb run was found by Salah and then produced a pinpoint cross for Diaz to tap into a half-empty net.
Cody Gakpo: 8 (Nunez, 66)
William Saliba had the beating of him early on but he made up for that by heading home Robertson's cross.
Won a dangerous free-kick later in the game after an eye-catching individual run.
Luis Diaz: 7 (Jota, 79)
Tapped in Szoboszlai's cross but could easily have had more.
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