Taqele Naiyaravoro went over for three tries

Tries from Duncan Weir, James Malcolm, Tim Swinson and a treble fron Taqele Naiyaravoro gave Warriors a comfortable win in the end and mean they go into next weekend's return fixture with plenty of confidence.

Glasgow got off to a flying start with a try in just the sixth minute from stand-off Weir that he converted himself.

Scarlets, who had their fair share of first-half possession, replied five minutes later with a penalty from Shingler.

However, Warriors still looked the more likely side and in the middle period of the half they passed up three good chances to forge ahead.

The first was the clearest when, following a clever kick from centre Alex Dunbar that put the visitors' defence in a daze, full-back Stuart Hogg failed to hold a simple interception with the line seven metres away.

Then Naiyaravoro caught a Scarlets clearing kick and squeezed in, but was judged to have gone out of play in the process.

Finally, a charge down by Adam Ashe of a clearing kick bounced cruelly for the home side behind the Scarlets' line.

In the last minute of the half Glasgow scrum-half Mike Blair's quick tap led to a penalty that Weir struck home to give Glasgow a 10-3 half time lead.

Scarlets made a smart restart and a move started with a break by winger Mike Tagicakibau ended with a simple penalty for Shingler.

But Scarlets remained haunted by conceding penalties. Weir put one to the corner in 51 minutes and the line-out drive ended with a try for hooker Malcolm on his starting debut, which Weir converted.

Five minutes later the outcome was decided. From a standing start Naiyaravoro knocked two Scarlets aside as he finally got his try, converted by substitute Russell.

Scarlets still had the spirit to have replacement Jack Condy held up over the Glasgow line.

In the 70th minute, however, Naiyaravoro was all on his own on the right wing to collect, and run in for the bonus point, a cross kick from Russell.

Four minutes later he secured his hat-trick from an interception that went unconverted, and then replacement lock Swinson closed the match with the sixth Glasgow try, converted by Russell.