West Ham have only lost one of their 12 previous home league games against Crystal Palace (W6 D5).
Crystal Palace have won just five of their 24 away London derbies in the Barclays Premier League (D5 L14).
Against Everton in midweek Palace scored 3+ goals in successive away games for the first time in their top-flight history.
Only once in top-flight history have Palace won five games in a row before (December 1992).
If the season had started when Tony Pulis took charge of Palace, the Eagles would be in eighth place.
Only Chelsea (14) have conceded fewer goals than Palace (20) in the period Pulis has been in charge.
Palace have conceded fewer goals (20) in Pulis’ 22 games in charge than they did in the previous 12 this season (21).
West Ham have lost five of their last seven Premier League games.
Palace have scored only 16 goals from open play this season yet have 40 points.
The last time both of these sides were in the top-flight and both avoided relegation was the 1971-72 season.