The track from market trader-turned-popstar Muhammad Shahid Nazir has had over 3 million views on YouTube since debuting earlier this week.
"In a cab and One Pound Fish has just come on the radio like a NORMAL SONG..." Xtra Factor co-host Caroline Flack posted on Twitter. Nazir had previously performed the novelty track on The X Factor, but was rejected at the auditions round.
The Bollywood-themed song has drawn comparisons to Psy's breakout hit 'Gangnam Style'.
According to bookmakers William Hill, Arthur is at 9/2 for the number one position, while Nazir's 'One Pound Fish' is currently at 33/1.
Nazir is ahead of Adele (50/1), Justin Bieber (66/1) and Leona Lewis (100/1) to take the top spot.
Watch 'One Pound Fish' below':