Hydel will seek to go a step closer in defence of their title when they face St James in semi-final two of the Scotiabank Prep School Cricket competition.
This will take place today at the Manchester High School cricket ground, starting 1:00 pm.
Three-time Middlesex champions Monymusk, who won the national crown in 2009, play Surrey runners-up Our Lady of the Angels, who are reaching this stage of the competition for the first time and precedes the main event beginning 9:00 am.
The semi-final winners will meet in the June 21 final scheduled for Lucas.
Clarendon's Monymusk qualified for the semi-finals last Friday after crushing Mount St Joseph of Manchester by 116 runs at Bushy Park.
Monymusk remain the only team to have ever taken the title out of Surrey and victory over their less fancied opponents would take them a step closer to repeating such feat.
Hydel, meantime, claimed their third Surrey title overall and second in a row following a 27-run victory over first-time finalists Our Lady of the Angels at Nelson Oval, Lucas, also on Friday.
By virtue of reaching the Surrey final both Hydel and Our Lady of the Angels were guaranteed a place in the four-team national play-offs.
The game provided excellent practice for both teams ahead of today's semi-finals with Hydel facing a St James Prep team hungry for success.
St James Prep have been the most dominant team in Cornwall in recent years, as they secured a fourth straight County title this season.
But the national title remains an elusive goal, though victory over their more accomplished rivals today could see their long-awaited dream becoming a reality.