Liverpool's Lucas Leiva (2nd R) celebrates with teammate Simon Mignolet (R) after winning the penalty shootout against Middlesbrough in their League Cup soccer match at Anfield in Liverpool, northern England September 23, 2014. Liverpool won 14-13 on penalties. [Photo/Agencies]

LONDON - Liverpool reached the fourth round of the League Cup on Tuesday after winning an epic and nerve-shredding penalty shootout 14-13 at home to second-tier Middlesbrough, with the teams ending extra time tied at 2-2.

Middlesbrough's Albert Adomah brought the gripping penalty contest to an end when he fired wide after both teams had kept their nerve in sudden death, shattering the record for the longest shootout in the League Cup.

Liverpool, who have looked a shadow of the team that finished second in the Premier League last season in the new campaign, twice took the lead against their lower league opponents, but defensive errors were once again their undoing.

Elsewhere, Nathaniel Clyne scored with a stunning 30-metre strike as Southampton won 2-1 at Arsenal and Swansea City, who have begun the league season in confident fashion, beat Everton 3-0 with goals from Nathan Dyer, Gylfi Sigurdsson and Marvin Emnes.

In another all Premier League tie, Stoke City came back from a goal down to win 2-1 at Sunderland thanks to a double from Spaniard Marc Muniesa.