The 23-year-old became a hero for the Hammers when his strike helped defeat Leicester City 2-1 on the penultimate round of action in the Championship, the second tier of English football.
West Ham fell behind to an opener from Jermaine Beckford but Reid restored parity when he latched onto a Mark Noble pass and found the net from about five metres out with his right foot in the 39th minute.
The victory was secured in style when Jack Collison hit home a stunning effort just before the hour mark.
The East Londoners have now closed to within two points of second-placed Southampton with one round to go before the promotion play-offs, which feature the teams placed third to sixth, begin.
The win ensures the race to finish in the top two and earn automatic promotion to the top flight extends to the final day this weekend.
Southampton are favourites to join Reading in going up as the Sanits are at home to already-relegated Coventry City on Saturday while West Ham welcome Hull City to Upton Park.
For West Ham to earn the remaining automatic promotion spot, they will have to beat Hull and hope Southampton slip up against Coventry.
Reid takes Hammers hopes to final day
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