|LV County Championship Division Two, Swalec Stadium|
|Close, day three: Surrey 575-7 dec, Glamorgan 377-9|
|Surrey 7pts, Glamorgan 5pts|
Glamorgan are likely to have to bat out the final day in order to avoid defeat against Surrey in Cardiff.
Resuming 95-4 in reply to Surrey's 575-7 declared, Glamorgan resisted in the shape of Mark Wallace (55) and nightwatchman Huw Waters (54).
Graham Wagg (48) and Stewart Walters also contributed as the home side battled to avoid the follow-on.
They reached the close on 377-9, still 49 short of ensuring that the visitors have to bat again.
Waters' rearguard action was particularly impressive as he beat his previous career-best of 34, scored against Kent at Canterbury in 2005, by completing a maiden first-class half-century.
However his resistance was ended in the next over when he was run out by Tom Maynard going for a risky single having batted for three hours 24 minutes and facing 169 balls.
DAY THREE REACTION
BBC Wales cricket correspondent Edward Bevan: "To reach 377-9 was a commendable effort by Glamorgan's batsmen and a similar performance is needed on Saturday if the home team are to avoid defeat.
"Nightwatchman Huw Waters started the fightback, defying the Surrey bowlers for three-and-a-half hours for his career best 54.
"There were also notable contributions from Mark Wallace (55) and Graham Wagg (48) as Glamorgan gained four batting points.
"They require a further 49 runs to avoid the follow-on. If they achieve that then they will have avoided defeat."