Daniel Ricciardo says Red Bull Racing did some "good stuff" on the opening day of the post-Spanish Grand Prix test, including running with some "crazy aero things" in the morning.

The Australian, who had to settle for fourth place in the race on Sunday, managed 89 laps in total, despite a "slow start", finishing up sixth overall on the timesheets, around a second off the pace set by Ferrari driver and ex-team-mate Sebastian Vettel.

"It was OK, we had a few new bits on the car and tried a few new bits and crazy aero things on the car this morning. It all went pretty good and [it was] another glorious day of testing! It's not as exciting as a Grand Prix weekend, I can tell you that much but we did some good stuff," said Ricciardo.

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"[It was a] bit of a slow start today, but we got the important things out of the way and we have another day tomorrow for the team, at least," he added.

"We're pretty happy with how it's all looking so we need to refine the data tonight - it was all pretty reliable, everything ran as smooth as it could."

Meanwhile, Ricciardo added that Red Bull is unquestionably moving forward and he believes Monaco next up will be a real opportunity.

"The progress is definitely there now to make the next step which will be the last step we're after to get after the Mercedes," he continued.

"We're getting closer and that's obviously exciting. Monaco will be our best chance yet, obviously we had a good chance last weekend, but for pure speed...Monaco should be interesting. We'll try to take what we can but, yeah, we'll see.

"Three street circuits coming up, it'll be good fun."