Background: Owen was born in Chester, Cheshire, the fourth child of Jeanette and Terry Owen. His father is a former professional footballer and played for clubs such as Chester City and Everton. Owen was introduced to football at the age of seven by his father who soon saw Michael as the most promising athlete in the family. A boyhood Everton fan, Owen attended Rector Drew Primary School in Hawarden, Flintshire, north Wales and by the age of ten, some of the nation's leading scouts were monitoring his progress.
Context: Owen scored his first goal for United back from injury in a 7-1 pre-season victory against a League of Ireland XI on 4 August 2010 at the newly built Aviva Stadium. On 22 September 2010, Owen netted his first goals of the season as he netted twice during a 5-2 away win over Scunthorpe United in the third round of the League Cup. Four days later, Owen scored his first league goal of the season as he netted United's second equaliser with his first touch in a 2-2 away draw against Bolton Wanderers. Owen's first goal of 2011 came in United's 2-1 FA Cup victory over Southampton at St Mary's Stadium on 29 January. On 25 February, United manager Alex Ferguson said that Owen was a key part of his squad for the rest of the season. However, he suffered a groin injury and missed his team's next four games. His return match was on 19 March when he returned to the bench for United's game against Bolton.  By the time of United's penultimate game of the season, he had reached the number of league appearances required for a title winner's medal - his first in 15 seasons as a professional. The game, on 14 May 2011, only required United to draw with Blackburn Rovers at Ewood Park to win the title, and a 1-1 draw secured it for them. Owen was an unused substitute in the game. Owen scored United's final goal in their last league game of the season, at home to Blackpool, in which the Red Devils won 4-2.  Owen was an unused substitute in Man United's uninspiring Champions League final defeat to Barcelona, marking the end of his season. He signed a one-year extension to his contract on 1 June 2011.
Question: when did owen score his first competitive goal?

Answer:
Owen scored his first goal for United back from injury in a 7-1 pre-season victory