That has extended West Ham's winless run in the to seven games as they sit 18th in the Premier League table, two points adrift of safety, and Moyes has warned his team that the mistakes need to stop or he will look for new players.
Spurs nearly lost in show-stopping fashion when defensive midfielder Obiang was allowed room 30 yards from goal to unleash a thunderous 70th-minute shot into the top corner beyond a helpless Hugo Lloris.
A 1-0 win over Chelsea and a gruelling 0-0 draw with Arsenal means United have taken five points from London derbies within the past month.
On a rare foray forward the midfielder found himself in space and belted a right-foot shoot that left Spurs keeper clawing at thin air as the ball whistled into the top corner.
Ettiene Lavigne: "vamos a sorprender desde las primeras etapas"
San Juan de Marcona - S.J de Marcona, 444 km (330 Esp.) Etapa 5 (10/1). 12 de enero: Descanso en La Paz, Bolivia. Serán seis etapas por Perú; tres por Bolivia y las cinco restantes por caminos de la Argentina.
When Harry Kane is enduring a rare spell of frustration in front of goal, Tottenham can always turn to Son Heung-min - as creator or scorer.
"But that is football. I hadn't really seen him doing it in training yet".
"The club should have an idea of what is required in the transfer window, we need extra players".
'I actually think it was individual mistakes in the games that are costing us, so we either have to eradicate it or find people who are not going to make the individual mistakes'.
Spurs amassed 31 shots at goal to the Hammers' three, missing their chance to close the gap to fourth-placed Liverpool.