Wiseman Park Wollongong City remain the only unbeaten club heading into Saturday's round five in Illawarra Grade 1 pennants, following a tight home win over Corrimal.

Wiseman Park won all three rinks and 56-47 overall to make it three wins and a draw from four rounds, with the other undefeated side Albion Park beaten by Towradgi.

Wiseman Park have added to their squad this season and in particular have improved their lead and second positions in a bid to challenge Warilla for the title.

Corrimal have certainly improved in 2015 with Wiseman Park's three rink wins all by four shots or less.

In other games, Towradgi Park claimed their first victory of the season, winning two of the three rinks in a 68-51 away win over Albion Park.

Wes Falconer's 25-12 win for Towradgi over Mal Pearson was the biggest margin of the day.

Albion Park skip Dean Aitken beat David Wakeling 27-19 and Towradgi's Guy Vozza beat Wayne Turner 24-12.

The result left Woonona as the only club without a win in Grade 1 after Woonona were beaten 58-51 by promoted Windang.

Windang's seven-shot victory was their first of the season and left Woonona bottom of the table.

Meanwhile, Figgy Bowlo made it three wins from four rounds with an impressive 70-60 away victory over struggling Dapto Citizens.

Figgy Bowlo skip Jim Kambouris had a 27-18 win over Brian Harriott in the key rink.

Citos have made the last seven grand finals but managed to just draw one rink against Figgy Bowlo, with the loss leaving them with only two wins from the opening four matches.

Defending champions Warilla remain just a point behind Wiseman Park after outclassing Thirroul 91-33.

In Saturday's round five, Corrimal host Albion Park, Woonona welcome neighbours Thirroul, while Figgy Bowlo have their biggest test of the season at home to Warilla.

Scottish internationals Alex Marshall (Warilla) and Graeme Archer (Figgy Bowlo) will be hoping to go head-to-head in what would be a great match.

In the other games, Citos face a huge home game against Wiseman Park and Towradgi host Windang.

LADDER

Wiseman Park 7, Warilla 6, Figgy Bowlo 6, Albion Park 5, Corrimal 4, Dapto Citizens 4, Windang 3, Towradgi 2, Thirroul 2, Woonona 1.