Valentino Rossi is already anticipating a tyre dilemma following the opening day of free practice for the Indianapolis MotoGP.

The Movistar Yamaha rider topped the FP1 session in the morning using the hard Bridgestone rear, but dropped down the times to ninth in FP2 with a best lap of 1m 33.598s.

Rossi, who fastest time was 0.716s down on pacesetter Marc Marquez, said: "Here it's difficult to decide on a tyre, because both the medium and the harder tyre are not bad.

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"The softer tyre is a bit faster, but it will be difficult to make it last for the whole race, so we have to try to decide.

"I tried to put the softer tyre in on the end of the session and I improved my lap time," he added. "From the third position all riders are very close... we have to modify something, especially in acceleration and try to make a good qualifying."

Rossi also gave a big thumbs-up to the new-look Indy circuit, praising the quality of the resurfacing work.

"I like the circuit very much. The corners, for me, are a lot faster and a lot more fun. The big step is the asphalt; the surface. Before the surface didn't have enough grip and it was very difficult to ride the bike. Now, they did a good job. You can control the bike in a better way. I'm very, very happy about the track."