By Daniel Moxon Mercedes have confirmed that an engine failure forced Lewis Hamilton to retire from the Australian Grand Prix. Hamilton’s race in Melbourne lasted for just 20 laps. He had started 11th on the grid after an awful qualifying, but his weekend got worse when he reported a problem with his power unit over the radio. He tried to limp back to the pits but was unable to do so. Instead, he was forced to pull over at the side of the track and it was confirmed that he would be taking no further part in the Grand Prix. It made Hamilton the second retiree from the Melbourne race. The first …