Phoenix Suns top-scorer Devin Booker is reportedly unlikely to play in Game 3 or Game 4 of their first-round series against the New Orleans Pelicans.

Booker, 25, scored 31 points in the first half of Game 2, but tweaked his hamstring with five minutes remaining in the third quarter when trying to contest Jaxson Hayes at the rim, immediately leaving for the locker room.

ESPN's Adrian Wojnarowski is reporting that while the injury is considered "mild" and Booker is not being ruled out for the series, "it appears unlikely he will be able to play in Games 3 and 4".

The injury could have seismic repercussions for the favourites to take out this year's NBA Championship, as what was once considered to be a likely sweep, may now become a case of the Suns being on upset-watch.

From the point Booker was substituted out of Game 2, the Suns were outscored 48-40 in just under 17 minutes, allowing 69 second-half points in the process. For the season, Phoenix only allows opposition teams to score an average of 54 in second-halves.

While the Suns are clearly not a one-man team, if there is one player they could not afford to lose, it is Booker.

In games this season where Booker has played, Phoenix have a record of 56-12 – and winning percentage of .824 – and were just 8-6 in games he missed.

In addition, the Pelicans are a much better side than their 36-46 record indicates.

After starting their season with just one win from their first 14 games, New Orleans went 32-30 from their last 62 contests, banking wins over playoff teams including the Golden State Warriors, Memphis Grizzlies, Utah Jazz, Dallas Mavericks, Milwaukee Bucks, Minnesota Timberwolves, Toronto Raptors – and the Suns.

Since the All-Star break – around the time they added key starter C.J. McCollum through a trade with the Portland Trail Blazers – the Pelicans have been a top-10 offense and a top-10 defense, with a net-rating of 4.7, only slightly behind Phoenix's 6.0 over the same time period.

New Orleans are a team playing their best basketball at the right point of the season, and have a young star looking poised to elevate himself into the conversation of the game's most elite offensive players.

In the Pelicans' four postseason games, including the two play-in fixtures, Brandon Ingram is averaging 28 points, 6.8 rebounds and six assists, including going off for 37 points, 11 rebounds and nine assists in the Game 2 win to even the series.

Health and momentum are now on the Pelicans' side, as they head back to New Orleans for Game 3 and Game 4 in games Booker is unlikely to suit up for.

While the Suns have kept their head above water in games he has missed, they are just 2-5 on the road when Booker has not played, and they will need at least one more win before heading back to Phoenix for Game 5, or else it could shape up as an upset for the ages.

An eighth seed has only defeated a one seed on four occasions in NBA history: the 1993-94 Denver Nuggets defeated the Seattle Supersonics; the 1998-99 New York Knicks toppled the Miami Heat en route to the NBA Finals; the 2006-07 'We Believe' Golden State Warriors against the Dallas Mavericks; and the 2010-11 Memphis Grizzlies beating the San Antonio Spurs.