Victoria v South Australia
MCG, 10.30am local time
Victoria Bushrangers squad: Cameron White (c), Scott Boland, Dan Christian, Travis Dean, Aaron Finch, Sam Harper, Marcus Harris, John Hastings, Jon Holland, Glenn Maxwell, Marcus Stoinis, Chris Tremain
South Australia Redbacks squad: Travis Head (c), Nick Benton, Alex Carey, Tom Cooper, Callum Ferguson, Jake Lehmann, Joe Mennie, Kane Richardson, Chadd Sayers, Kelvin Smith, Jake Weatherald, Adam Zampa
The top two sides in the competiton face off this weekend as the unbeaten Bushrangers host South Australia.
Victoria have had convincing wins over New South Wales, Queensland and Tasmania to start the Shield season, and will look to continue their strong form at home against the Redbacks.
South Australia regain second Test debutants Callum Ferguson and Joe Mennie for the match as Chadd Sayers will also play, after being selected as the 12th man for Australia during the third Test.
After the strong start they've had, it's hard to go past Victoria on their own deck.
Tasmania v New South Wales
Blundstone Arena, 10.30am local time
Tasmania Tigers squad: George Bailey (c), Cameron Boyce, Jake Doran, Ben Dunk, James Faulkner, Hamish Kingston, Ben McDermott, Simon Milenko, Sam Rainbird, Jordan Slik, Cameron Stevenson, Beau Webster
New South Wales squad: Moises Henriques (c), Doug Bollinger, Ryan Carters, Harry Conway, Trent Copeland, Ed Cowan, Ryan Gibson, Daniel Hughes, Peter Nevill, Kurtis Patterson, Gurinder Sandhu, Will Somerville
Tasmania and New South Wales will do battle in Hobart this weekend, as both sides have had differing starts to the season.
The Tigers picked up their first win of the season after beating Western Australia last weekend, while the Blues lost their first Shield match in the competition after going down to Victoria last time out.
Double-ton hero Alex Doolan won't play for the Tigers after suffering a delayed concussion during their win over WA.
NSW welcome Peter Nevill back from Test duty, and should have enough talent in their squad to get an away win.
Queensland v Western Australia
Tony Ireland Stadium (Townsville), 10am local time
Queensland Bulls squad: Chris Hartley (c), Joe Burns, Ben Cutting, Jason Floros, Peter George, Sam Heazlett, Charlie Hemphrey, Marnus Labuschagne, Michael Neser, Mitch Swepson, Sam Truloff, Jack Wildermuth
Western Australia Warriors squad: Michael Klinger (c), Ashton Agar, Cameron Bancroft, Jason Behrendorff, Hilton Cartwright, Simon Mackin, Mitchell Marsh, David Moody, Josh Nicholas, D'Arcy Short, Ashton Turner, Jonathan Wells, Sam Whiteman
Western Australia will travel to Queensland in the hope they can win their first match of the season after starting 0-3.
Losses to Tasmania, New South Wales and South Australia have the Warriors in last place on the table and winless.
Queensland secured their first win of the season against South Australia last weekend, as they took the final Redbacks wicket of Chadd Sayers with just two overs remaining on the final day of the match.
Joe Burns returns for the Bulls and replaces Matt Renshaw who is making his Test debut, while Adam Voges sits out for WA following his head knock last weekend.
Queensland at home should be too strong for WA in this one.