Chelsea surrendered the Premier League lead it held since the opening day of the season with a 1-1 draw at Newcastle on Sunday.
While Tottenham came from a goal down to beat Liverpool 2-1, Chelsea conceded a sixth-minute opener to Andy Carroll and needed an equalizer from Salomon Kalou in first-half injury time to avoid a third straight league defeat.
Chelsea has now taken just four of the last available 15 points and trails Manchester United by two points.
The Red Devils routed Blackburn 7-1 on Saturday to preserve the league’s last unbeaten record and wipe out Chelsea’s long-established superior goal difference.
Sunday’s results meant that all 20 Premier League sides scored over the same weekend for the first time.