The Fab Four became the Dynamic Duo this year as all-time great Roger Federer decided to ease his schedule and bypass this event for the first time since turning pro in 1999. On Sunday, three-time Sony Open runner-up Rafael Nadal followed suit when he pulled out after winning the Indian Wells' title for the third time. Mardy Fish, Ernests Gulbis and Stanislas Wawrinka have also pulled out.
World rank/seed: 1/1 Ht/Wt: 6-2,176 Age: 25
Best finish at Key Biscayne: Champion in 2007, 2011-12
Notable: He seems recharged after enduring a slight letdown after his historic 2011 season when he won 10 tournaments, including three Slams and five Masters 1000 events. Djoker won his third straight Australian Open title and is 17-1 this year after a loss to Del Potro in Indian Wells semi.
World rank/seed: 3/2 Ht/Wt: 6-3,185 Age: 25
Best finish at Key Biscayne: Champion in 2009
Notable: Since joining forces with Ivan Lendl, the Great Brit has gained the confidence and swagger to go for the lines in crunch time as he showed in winning his first major at the U.S. Open last summer. He lives and trains in Miami, but is 7-11 against Djokovic.
Juan Martin del Potro
World rank/seed: 7/5 Ht/Wt: 6-6, 214 Age: 24
Best finish at Key Biscayne: 2009 semifinals lost to Murray
Notable: The gentle giant was on the verge of breaking into the top tier when he won the U.S. Open in 2009, but wrist surgery derailed his rise. Healthy again, Delpo is riding the high of knocking off Murray and Djokovic before losing to Nadal in Indian Wells final.
World rank/seed: 6/4
Ht/Wt: 6-5, 200 Age: 27
Best finish at Key Biscayne: 2010 final, losing to Andy Roddick
Notable: A perennial semifinalist in big tournaments, Berdych seems to lack confidence on the big points against the top four players, like in his loss to Nadal in the Indian Wells semis. With Federer and Nadal out, this could be his best chance to win his second Masters title, but first since 2005.
World rank/seed: 8/6 Ht/Wt: 6-2, 200 Age: 27
Best finish at Key Biscayne: Three quarterfinals in 2009-10, 2012 with two losses to Nadal
Notable: Personable Ali-lookalike has won 10 titles, all on hard courts. He has the flair and power to beat anyone, but sometimes conditioning and concentration do him in.
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