Hewitt, who won the tournament three times from 2000 to 2002 and again in 2006, defeated third-seeded Juan Martin del Potro 6-2, 3-6, 6-2. Hewitt didn't allow del Potro a break chance in either the first or third sets in advancing to the tournament semifinals.
No. 1-seeded Andy Murray, who won championships in 2009 and 2011, stopped Benjamin Becker 6-4, 7-6 (7-3) in his quarterfinals. Becker broke Murray's serve three times but Murray ended up with four breaks.
No. 4-seeded Jo-Wilfried Tsonga claimed the final place in the semifinals, beating Denis Kudla 6-3, 6-2 in less than an hour. Tsonga fired off 13 aces and won more than three-quarters of the points on serve.
Murray and Tsonga are paired against each other in one semifinal. Murray has won seven of their eight career meetings. Hewitt was a straight-set winner over Cilic in the 2012 Olympics, the only time the two played each other.