Andy Murray produced a masterclass in tennis to destroy the highly rated Milos Raonic on Monday and book his place in the quarter-finals of the US Open. The Olympic champion provided more evidence he could be ready to add a first grand slam title to the gold medal he won in London last month when he blunted one of the biggest serves in the game to win 6-4 6-4 6-2. Serena Williams charged into the women’s quarters with a 6-0 6-0 win over Czech Andrea Hlavackova while Roger Federer was gifted a spot in the last eight when Mardy Fish withdrew from the year’s final grand slam. Poland’s Agnieszka Radwanska, the women’s second seed, became the highest ranked casualty of the tournament when she lost to Roberta Vinci 6-1 6-4.