Tough-as-nails sprinter Mr Big is back in business as he makes his much-awaited racing comeback in the $125,000 Open Class race over 1100m on Polytrack on Sunday.

After suffering the disappointment of having to scratch Rocket Man from the $1 million Group 1 KrisFlyer International Sprint over 1200m earlier in the week, trainer Patrick Shaw was able to savour back-to-back victories in Singapore's richest sprint on Sunday night.

The forecast is for a slightly overcast day with a max in the low 30s for the big International day in Singapore.

We think there was trackwork going on at Kranji this morning but the rain was so heavy you could hardly make out the horses.

After the safe delivery of Singapore Airlines International Cup contender Chinchon earlier in the morning, Saturday's second batch of international arrivals in the afternoon also took place without a glitch for Krypton Factor and Invincible Ash, both KrisFlyer International Sprint contenders.