Saints boss Daniel Anderson:
"I'm pleased with the win and the points. We had to hang in there at the end of the first half but I thought we totally controlled the second half.
"We're still not playing in a composed manner and we're really trying to play consistently well but it's not quite working at the moment.
"Having said that we did score some wonderful tries. We got a bit lucky with the try on half-time because I thought there was no time left and I thought that try broke Quins' confidence."
Harlequins: McLinden, Wells, T. Smith, Lucky Luisi, Melling, Hill, Orr, Temata, Randall, Heckenberg, Hopkins, Grayshon, Purdham. Replacements: Rinaldi, Worrincy, McCarthy-Scarsbrook, A. Smith.
St Helens: Wellens, Tyrer, Gidley, Talau, Meli, Pryce, Long, Fozzard, Cunningham, Cayless, Sculthorpe, Bennett, Hargreaves. Replacements: Roby, Graham, Clough, Fa'asavalu.
Referee: I Smith (Oldham)