What's left to say about Roger Federer? Winning his 18th Grand Slam at the Australian Open in January, Federer is back at the top of the world rankings at the age of 36. And he likes Miami. Likes it a lot. With a total of three tournament victories here, he's the defending champ after defeating Rafael Nadal in the 2017 final.
 

2. The rising British star

Thought British tennis was all about Andy Murray? You thought wrong. Newly crowned UK number one Kyle Edmund made everyone take notice by reaching the Australian Open semi-finals in January. Now up to world number 24 (putting him above the likes of Jo-Wilfried Tsonga and Milos Raonic) the 23-year-old will have plenty of players quaking in their sneakers in Miami.
 

3. The “Tower of Tandil”

Juan Martín del Potro continues to spend most of his time trying to stay fit, but when he's on form you'd better watch out. A former semi-finalist in Miami, the Argentine is now back in the world top 10 after reaching the final of January's ASB Classic in Auckland. After battling injury for so much of his career, this gentle giant deserves a bit of luck.
 

4. The firecracker

Nick Kyrgios is like a box of chocolates – you never know what you're going to get. And he's bad for your blood pressure. Will we see a focused Kyrgios in Miami? Or will we see the racket-smashing Kyrgios? Your guess is as good as ours, but one thing is for certain: the Aussie never fails to create headlines.
 

5. The forgotten man

After delaying the start to his 2018 campaign due to fitness struggles, Novak Djokovic has only recently returned to action. But let's ease up on the sob story. Having won this tournament six times (most recently in 2016) this is a happy hunting ground for the current world number 13.
 

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