Marc Marquez topped the opening MotoGP Spanish Grand Prix practice from Jerez in a session in which the entire 22-rider field was split by 1.380 seconds. The first practice session since November's Valencia GP got off to a frenetic start, with top sport changing hands several times in quick succession. Pramac Ducati's Jack Miller set the benchmark pace on his first lap at a 1m39.673s, which was quickly toppled by Wednesday's test pacesetter Maverick Vinales on the factory Yamaha. Vinales' 1m39.426s was traded for a 1m38.496s with Miller, which the Yamaha rider responded to with a 1m38.215s - a laptime matched by reigning world champion Marquez The Honda rider's follow-up lap was better...
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