It's 20 years this year since Arsenal last made the Champions League final but they're 4/111.36 to qualify on Tuesday night and 4/61.67 to do it by beating Atletico Madrid in the 90 minutes.
And you have to fancy the Gunners, who admittedly have had a soft run in the knockouts but the ties still need winning - and after Bukayo Saka marked his first start since March with a goal and assist in a thumping win over Fulham Arsenal sould be in great spirits.
Atleti are 4/15.00 to win the match at the Emirates and 21/103.10 to go through and with a good few injury problems you can see why - this looks a tough night at the office but they should at least put in an improved display from the 4-0 defeat at the Emirates back in October.
And outside of the usual result markets, there's a value play on Atletico's shots and fouls stats, which we can combine for a nice Bet Builder double.
They had 18 shots against Arsenal last week and even managed 11 in that heavy defeat last time here, while they've managed 14 and over 10 times in the Champions League this season, and there's several game states which would see them match those numbers.
And in terms of fouls, 12 is a number they've hit five times, with another couple of 11s, so away in the semi-final should see those numbers rise.
Back Atletico 14+ shots and 12+ fouls
Listen to Football...Only Bettor UCL SF 2nd legs preview
There's a lot of more sexy player prop bets around goals, assists and shots etc, but I like the fouls markets in big games, especially big European semi-finals.
And for this one I'm picking out William Saliba to give away 2+ fouls at 12/53.40 which could be a nice slice of value if we've judged this one correctly.
He didn't give away a foul last week at Atletico, but he's had multiple fouls in six of 10 Champions League games so far this season.
Saliba looked shaky against Sporting in a tight second leg at the Emirates in the last round - and this one could well be tight and tense again.
Plus Atletico will be a test, they'll attack Arsenal and even if they're behind they'll put the pressure on and I can see Saliba having to bring a few players down to stop them or looking a little uncomfortable again.
For a centre half with as much form for multiple fouls in games in Europe this looks a decent shout.