I don't see many scenarios where win, but equally I don't think we will see a repeat of the 81-55 loss inflicted the last time the teams competed in the 2019 EuroBasket 3rd/4th playoff match. Will probably come down to which team is able to put the disappointment of today behind them the quickest.
Serbia aren't playing as well as they have previously so it is possible that if GBR can put them under pressure early on, it could be close but most likely scenario is that Serbia take the win by something in the region of a 5-15 point margin.
Ultimately, GBR were let down today by their free throw conversion rate which was just 50% and they must be kicking themselves because with the mess in the other groups, they had a great opportunity to get to the quarters and put themselves in strong position to get into the Olympic qualifying tournament. Now, the chances are that they will lose on Tuesday, fail to make the quarters, have no place in the OQT and will end up with UK Sport cutting their funding so all in all, today could prove an expensive loss.