at Aldershot Town, saving Marvin Morgan's 86th-minute penalty to keep the scores tied. Stevenage's tight defence had helped Stevenage earn one of the four play-off spots as a result of finishing in sixth place. He kept two clean sheets in Stevenage's games against Accrington Stanley in the play-off semi-finals, which Stevenage won by a 3–0 aggregate scoreline. Stevenage earned promotion to League One after a 1–0 victory against Torquay United at Old Trafford on 28 May 2011, with Day playing the whole game and keeping a clean sheet. Similarly to the 2009–10 season, Stevenage's success was built on a tight defence, with the club conceding the fewest number of goals during the 2010–11 League Two season, with Day keeping 19 clean sheets during the campaign. Day played all of Stevenage's 56 games during the season, playing every minute of every game. Ahead of the 2011–12 season, Day dislocated his finger in Stevenage's pre-season victory over Fulham XI. He was subsequently ruled out of first-team action for a month, missing Stevenage's first three games of the season. Day made his first appearance of the campaign on 16 August 2011, playing the whole game in Stevenage's first win of season, a 3–1 away victory at AFC Bournemouth. Three days later, Day signed a contract extension with the club. He remained as Stevenage's first-choice goalkeeper for the remainder of the season, missing one further league match during the campaign. Stevenage's FA Cup run to the Fifth Round also presented Day with the opportunity to face his former club, and the team he supports, Tottenham Hotspur. The tie, played at Broadhall Way, ended goalless, with Day keeping a clean sheet. He also played in the replay at White Hart Lane in March 2012, which ended 3–1 in Tottenham's favour, the three goals scored by Tottenham were the only goals Day conceded in the club's six FA Cup games. During the season, Day made 52 appearances in all competitions, as Stevenage lost in the League One play-off semi-final to Sheffield United. Only league champions Charlton Athletic conceded fewer goals than Stevenage throughout the season. He started in Stevenage's first game of the 2012–13 season, a 3–1 victory over AFC Wimbledon in the League Cup on 14 August 2012, and kept successive clean sheets during the month as Stevenage started the season in good form. Despite the club being unbeaten in their first nine league games