* Tottenham beat West Ham 1-0 at London Stadium
* Lamela header before the break sealed the points
* Derby win moved Spurs up to third place
* Lively Arnautovic had best chances for West Ham
* Struggling Hammers remain stuck in 15th spot
* Spurs next host Man City, West Ham at Leicester
By Ken Ferris
WEST HAM UNITED 0 TOTTENHAM HOTSPUR 1
Oct 20 (Reuters) - Tottenham Hotspur secured a hard-fought 1-0 win over lowly London rivals West Ham United thanks to a deft first-half finish from Erik Lamela in their Premier League derby on Saturday.