Manchester Thunder secured a place in the Netball Superleague semi-finals with back-to-back wins, leaving four teams vying for the final spot.
Thunder beat Severn Stars 55-43 and Surrey Storm 57-41 to join Bath and Loughborough Lightning in progressing.
Wasps hold fourth place going into their final two matches – the first of which is against fellow semi-final hopefuls Saracens Mavericks on Monday.
Leeds Rhinos and Strathclyde Sirens are also in contention for a top-four spot.
The Sirens lost 48-37 to Bath in their first match of the weekend, but recovered to beat the Mavericks 41-35 and move up to fifth in the table.
The Rhinos are sixth after losing 59-51 to Lightning – who also beat Celtic Dragons 59-35 this weekend – and the Mavericks complete the top seven.
On Friday, Bath began their weekend with a 45-32 victory over Severn Stars, and London Pulse inflicted a 52-30 defeat on Dragons, who remain bottom, to secure their fourth win of the season.
Game of the week – Saracens Mavericks 35-41 Strathclyde Sirens
Given how tight the scrap is for top-four places, both teams may have viewed this as ‘must-win’.
It was the Sirens who held their composure and moved up to fifth as the Mavericks slipped further down the table. They do have four games to play, though – more than any other side in the league.
The Sirens started well and were three goals to the good at half-time, as captain Gia Abernethy linked defence with attack well. Youngster Emma Barrie missed only three shots all game, contributing 24 of her team’s points.
The Mavericks, who last featured in a semi-final in 2016, struggled to find the answers – head coach Kat Ratnapala said her side were “not good enough” and blamed a lack of consistency for their league position.
Her Sirens counterpart Karen Atkinson described her side as “fearless”, and said at the start of the season “no-one would expect us to be anywhere near top four”.
Results & fixtures
Round 17 & 18
Friday, 28 May
Celtic Dragons 30-52 London Pulse
Severn Stars 32-45 Team Bath
Saturday, 29 May
Loughborough Lightning 59-35 Celtic Dragons
Manchester Thunder 55-43 Severn Stars
Strathclyde Sirens 37-48 Team Bath
Sunday, 30 May
Loughborough Lightning 59-51 Leeds Rhinos
Saracens Mavericks 35-41 Strathclyde Sirens
Manchester Thunder 57-41 Surrey Storm
Monday, 31 May
Leeds Rhinos v Surrey Storm (17:15 BST)
Saracens Mavericks v Wasps (19:15 BST)