The Boston Celtics have been overcoming the odds all season and continued to do so in game one of their Eastern Conference semi-final showdown against the Philadelphia 76ers on Monday night.With All-Star duo Kyrie Irving and Gordon Hayward already ruled out for the entire playoffs, sophomore Jaylen Brown suffered a hamstring injury against the Milwaukee Bucks and was ruled out of the first clash with the 76ers.That left the C's even more shorthanded going up against an in-form Sixers outfit who had a fully healthy roster to choose from.But as the Celtics have shown all year, regardless of who they have on the floor, they'll be a match for any team.Philly found this out the hard way as Boston secured a dominant 117-101 win on their home floor.They may be missing their best offensive players but it's allowed a number of their talented youngsters to come of age and show their worth.Two players who have done so, in particular, are Terry Rozier and Jayson Tatum.The duo have been terrific in these playoffs and produced their best performances against the Sixers last night.Rozier dropped 29 points and was on fire from beyond the arc as he drained seven threes to follow up his 26 points in game seven against the Bucks on Saturday.Tatum added a career-high 28 points on 8-of-16 shooting as he outplayed fellow rookie Ben Simmons.He was attacking the basket all night and went to the free-throw line 12 times, knocking down 11.As well as the young pair, veteran Al Horford was immense on the night as he posted 26 points on a hugely efficient 10-of-12 from the field, as well as adding seven rebounds and four steals.The trio carried the load offensively for Boston all night and to put their performances into perspective, they combined to score more points (83) than the Celtics' legendary big three of Paul Pierce, Kevin Garnett and Ray Allen ever did in a single game, according to ESPN's Micah Adams.

The most that Pierce, Garnett and Allen combined for in any game - regular season or playoffs - was 79.

That's a hugely impressive feat, especially considering the inexperience of both Rozier and Tatum.

"It's been great to see Jayson and Terry and just our guys play like that," Horford said after the game, per ESPN. "I think that Jayson's starting to figure it out. ... And it's great to see for our team."

Boston is now undefeated in five games at home this postseason and they'll look to keep that unbeaten record intact and take a 2-0 lead to Philadelphia by winning game two on Thursday night.

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