F1 Singapore
Race weekend will see the main event kicking off at 1pm BST on race day.
Real-time commentary streamed on BBC Radio 5 Sports Extra and official website.
The team's Spanish veteran topped the times ahead of Scuderia star and Red Bull's Max Verstappen during first practice for the street circuit event.
McLaren's drivers Oscar Piastri and British talent concluded the session in mid-table positions.
The young Australian was over two tenths speedier than the Briton.
Alonso was a tenth and a half ahead of the Ferrari driver and 0.276secs clear than Verstappen.
The Italian squad's British icon was just outside the top three.
It is not expected that the Silverstone-based team will be contenders for the top spot.
That said, the team are hopeful of a improved performance on a low-speed track that is more suited to their vehicle, which runs more competitively when high levels of downforce are called for.
Double world title winner Fernando is also known as a street circuit master, and often shines on the Singapore circuit.
But he was almost certainly using reduced weight or a increased power than his rivals, or each, to set such a quick time.
Fellow driver Canadian racer was 1.918secs off the pace in P18.
The Canadian had difficulties with his driving position early in the session and was also testing experimental parts.
FP1 in Singapore is not reflective of race pace for qualifying and race as it is held in afternoon sun in late afternoon, while qualifying and the grand prix are staged under floodlights.
The McLaren driver has an advantage over his teammate by a quarter-century with seven races left heading into the weekend in the Lion City.
McLaren are set to wrap up the team title on Sunday.
The only way they can miss out in this race is if Mercedes beat them by over thirty or Ferrari manage it by a similar margin.
The energy drink brand's team are optimistic of a good performance after Max's wins in Monza and Baku preceding this event.
It was a relief when light rain coming down before the session stopped by the time the vehicles took to the track on a track that had not been wet.
Team consultant Red Bull's advisor stated before the session that they needed a dry hour to get underway on fine-tuning their car configuration for the weekend.
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Brian Hernandez
Brian Hernandez
Brian Hernandez
Brian Hernandez
Brian Hernandez