Sigala's Say You Do leads very close race for this week’s Number 1 single

Plus there are new entries and big climbers from Blonde, Sia and James Bay on this week's update.

It could be another photo finish on this week’s Official Singles Chart, as the race for the Number 1 is close again on today’s Official Chart Update.

Following last week’s battle for the top spot between Mike Posner and Lukas Graham, which was the closest in nearly a decade, Sigala’s Say You Do takes an early lead on this week’s chart by just 568 combined sales.

MORE: See the Official Top 100 Singles Chart Update in full

The DJ Fresh and Imani collaboration leaps 45 places following its download release and is currently just ahead of Posner’s I Took A Pill In Ibiza. If Sigala holds on to his position, it will mark his second chart-topper after his debut single Easy Love reached the summit last September.

Meanwhile, Lukas Graham’s 7 Years slips to 3, Zara Larsson’s Lush Life is at 4, and Fifth Harmony’s Work From Home completes the Top 5.

New entries and high climbers

Production duo Blonde are on course to land their third Top 10 single with Craig David collaboration Nothing Like This, and Sia’s Cheap Thrills is up six places to Number 10.

Further down the tally, James Bay’s Sport Relief single Running zooms 79 spots to 34, Chainsmokers’ Roses enters the Top 40 for the first time at 39, and Meghan Trainor’s latest effort, No, is currently just outside at Number 41.