Jose Mourinho has built a reputation for getting under the skin of opposition managers but the United boss was not up to his old tricks on Sunday.
Guardiola's men have sealed the title with five games remaining, equalling the record set by United in 1908 and 2001 - as well as Everton in 1985.
United prevented the Citizens from sealing the title at the Etihad Stadium last weekend after they fought back from two goals down to claim a shock 3-2 win in the 176th Manchester derby.
"It was a bad reaction after the City victory, the outcome of that is complicated football", Mourinho said. They've been by far the best team in the league.
However, Premier League survival still looks unlikely for the Baggies, who are nine points adrift of 17th-placed Swansea with four matches remaining.
After 10 days in which City had crashed out of the Champions League quarterfinals to Liverpool and lost the Manchester derby, Guardiola's team swept Tottenham Hotspur aside on Saturday night, winning by 3-1 at Wembley.
This result will not have any significant effect on the league table beyond placing the title in City's hands. I have seen many teams win it as champions for the whole season, and it's the first case for us.
Fast-forward to Sunday April 15, 2018 and Guardiola's City side has achieved a domestic double, adding the Premier League to the League Cup they won in February.
Manchester City midfielder Kevin De Bruyne on Twitter: Unbelievable season for us.
"We played against a really formidable team today", Moore told the BBC.
"I want the players to express themselves, show the outside world what good players they are".
Based on three points for a win, Manchester City's current points tally of 87 is the most by any side in English top-flight league history after 33 games of a season.
Former England worldwide Gary Lineker, who now work as a television presenter, tweeted: "Congratulations to @ManCity on winning the Premier League title".
The 2012 title win had the infamous last-gasp goal by Sergio Aguero.
"I'm proud for players and staff and way they have acquitted themselves today".
"If we focus all of our energy into the next match, I'm sure it'll look after itself".