Verstappen was only 0.123s ahead of Sainz, who couldn't improve on his first run and finished third by 0.129s.
The beginning of Lewis Hamilton and Max Verstappen's storied 2021 rivalry came all the way back in the Bahrain GP of the last season.
The first race of the season might very well see some newer faces on the podium, but the usual suspects should never be counted out.
Halfway through the hour, the reigning champion switched to soft tyres and set the fastest time with a time of 1m 31.936s.
The Dutch F1 champion will become the first since Vettel to choose the number one to defend his title.
The seven-time World Champion remains one title bereft of a world record and believes he will be more dangerous in the upcoming season.
Drivers have had to spend most of pre-season testing getting to know the cars and a unanimous verdict is that following is a lot easier.
Due to a late red flag caused by Valterri Bottas's stoppage, Max Verstappen only had 20 minutes for a final time attack.
Alonso believes Verstappen will now enjoy his time on the track as he prepares to mount his first-ever title defence.
Mercedes' Hamilton and Red Bull's Verstappen will be renewing their rivalry at the 2022 F1 Championships.