It is the big clash of the Highlanders First XV rugby competition.
The winner is likely to win the round-robin competition and take the top spot for the semifinals.
The big game between Otago Boys' High School and its old rival Southland Boys' High School will be played at Littlebourne this afternoon at 2.30pm.
It is the televised game on Sky Television's Rugby Channel and will be hosted by experienced rugby commentators Keith Quinn and Steve Davie.
Southland Boys' and Otago Boys' are two of the four unbeaten teams after four rounds of the Highlanders First XV competition.
The other unbeaten teams are King's and Gore High School that will play each other at the King's home ground at 1pm.
A big crowd is expected to watch the clash of the Titans at Littlebourne.
Otago Boys' and Southland Boys' have both been in dominant form this winter and have played exciting rugby.
Otago Boys' strength is in its fleet-footed backline that is able to counterattack from all parts of the paddock.
Key players are strong-running wing Tim Lawrence and fullback Liam Edwards who has reached 100 points for the season in just four games.
A feature of the Otago Boys' play is the ability of the backline to attack from broken play.
It is directed by halfback Kurt Hammer who combines efficiently with first five-eighth Lance Taylor.
Michael Collins is solid in the midfield.
Southland Boys' has a solid pack, with prop Campbell Wood and No 8 Campbell Smith expected to stamp their mark on the game.
Scott Eade is a shrewd tactician at first five-eighth.
Gore scored 10 tries when it beat Kavanagh College 64-0 last Saturday.
It is an exciting team that has the ability to use the width of the paddock to give their wings space to attack.
Gore has a strong pack with the best players being props James Matheson and Ben Crawford, who are efficient at the pick and go.
First five-eighth Hamish Cook punts accurately for territory and Hayden Stephen is strong on the wing.
Dynamic No 8 Junior Faa'vae has played a major role in the King's pack with his storming runs and his ability to break the advantage line.
Props Ayden Lloyd and Hayden Fleury are aggressive with the pick and go and openside flanker Tyrone Pelasio lively with the ball in hand.
Halfback Caleb Gray passes accurately and first five-eighth Gifford Henry captures large hunks of territory with his accurate punting.
The points table after four games is: Otago Boys', King's 20, Southland Boys' 19, Gore 18, Waitaki Boys', John McGlashan 9, Dunstan 6, Verdon 5, St Kevin's, Kavanagh College 4, South Otago 1, Central Southland College 0.
