Andrea Dovizioso worried by Marc Marquez's speed at Qatar MotoGP

After three consecutive runner-up finishes at the track, Dovizioso withstood a final-corner lunge from Marquez to win the first race of 2018.

But reigning champion Marquez was delighted with the race despite the defeat, as he'd come up just 0.027s short at a track that has not favoured his Honda bike in the recent years.

"Dovi is worried about Marc," Tardozzi said, "because this is a track more for Ducati and not for Honda, but Marc was there [in the victory fight].

"Then I said 'he is world champion and he demonstrated today, too'.

"All the respect from Dovi to Marc because he knows that he [Marquez] is the guy to beat."

Dovizioso came out on top in similar last-lap duels with Marquez twice last year, at Red Bull Ring and Motegi.

However, at both of those circuits Ducati was expected to have an edge over Honda, and it was Marquez who in the end beat the Italian to the 2017 riders' title.

Dovizioso admitted he did not expect to be left fighting with Marquez on the final lap again - and said the Spaniard "did something unreal to stay with me".

Asked whether his rival's Qatar performance was a worry, he said: "Yes, I think [it] is the reality.

"We confirm we are more competitive than last year but this race I think the Honda riders also confirm they are better than last year.

"I was able to beat him, looks like an important thing, but it's not in his good track.

"So it is really positive but you have to be objective, I know very well these things.

"I didn't expect to have him [fighting me] in the last few laps. That is the bad thing of the victory of today.

"Yamaha riders, [Johann] Zarco and Valentino [Rossi], I thought [were more likely]. [Alex] Rins, maybe [Andrea] Iannone.

"I expected to finish alone but not with Marc."