HOUSTON, June 23 : Portugal played with their heads not their hearts in thumping Uzbekistan 5-0 on Tuesday with a performance that showed the players learned their lesson from a disappointing draw in their World Cup opener, coach Roberto Martinez said. Cristiano Ronaldo became the first player to score in six World Cups while netting twice in Portugal’s rout of Uzbekistan as the team silenced critics following the 1-1 opening draw in Group K against the Democratic Republic of Congo. "When we