It's been an intriguing first half - with high intensity cheered on by a typically passionate home crowd in Serbia.
Backa have been impressive, with plenty of energy and neat interpassing, while the Hammers are also moving the ball quickly but without any clear openings so far.
Johnson has made a number of key blocks and tackles to keep the Serbs at bay. Up front Mubama has looked an isolated figure, trying to live off long ball scraps.
Benrahma is doing his usual 'almost' act out on the left, while Paqueta and Ward Prowse have been busily probing through the centre.
Aaron Cresswell had an almost howler with a misplaced pass across the back on the half hour mark as Backa have looked hungry but Fabianski saved the day, albeit after an initial fumble.
All to play for in the second half, but with Freiberg an impressive 4-0 up at home to Olympiacos, Moyes men will need to uo their game if they want to top the group.