By Jamie Spencer Manchester United defender Lisandro Martinez is embracing the competition for places as he attempts to force his way back into Erik ten Hag’s starting XI. Martinez started all of United’s first 14 Premier League games of the season prior to the World Cup break. Having gone all the way to the World Cup final with Argentina, becoming just the fifth player to get his hands on the trophy while on the books at Old Trafford, he was granted extra time off to rest and recover when club football resumed in late December. What Lisandro Martinez said to Scott McTominay after winning the …