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Honda's Marc Marquez moved closer to the title after victory at the Australian GP at Phillip Island.
The Spaniard took his sixth win of the season and now leads nearest challenger Italy's Yamaha rider Andrea Dovizioso by 33 points with just 50 up for grabs in the two remaining races at Sepang and Valencia.
Dovizioso closed the gap on Martinez after victory at Motegi in Japan last weekend, but his challenge has faded after finishing a disappointing 13th in Australia.
Marquez took the lead with six laps remaining and powered away to win comfortably in a time of 40 minutes 49.772 seconds.
The real excitement was behind him in a thrilling race for second.
Italian Valentino Rossi, who only returned to racing three weeks ago after a double leg break was second, 0.027secs ahead of Yamaha team-mate Spain's Maverick Vinales, who was just 0.016 in front of France's Johann Zarco, also on a Yamaha.
Britain's Cal Crutchlow was fifth on a Honda, a further two seconds back.
Three-time champion Marquez said: "I knew before the race that this was an important day. Dovy was struggling a little bit and I was feeling really good.
"Victory is important, but it makes me happier that I've got a 33 points advantage. It is a big advantage now. Now it's time to breathe, to understand what options are, where we can fight and do nothing stupid in the last two races."
You can watch the Malaysian MotoGP at the Sepang International Circuit on the eir Sport pack on BT Sport 2 on Sunday 29 October.
Image: Getty/ Micro Lazzari
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