The reigning champions of England are fitting opponents for Albion's 150th League game at the Amex.

The landmark is reached with the visit of Chelsea on Saturday.

During the Amex era, Albion have gone from Championship newcomers to the 16th highest club in the country.

The up-and-down ride has included three play-off failures, a fight to avoid dropping back into the third tier and promotion.

Apart from the 2014-15 season, the Amex has been a fortress. The other five-and-a-half seasons have produced just 21 defeats and 67 victories.

Here are five highs and five lows (which were far harder to find).

August 2011: Albion 2, Doncaster Rovers 1

Who will ever forget the first competitive match at the Amex, the electric atmosphere and a script fit for the occasion.

With the stadium in the infancy of its development, the crowd was only just over 20,000 but boy did they enjoy themselves.

Two late goals by substitute Will Buckley (below) provided the perfect comeback finale. Did I forget to mention Gus Poyet was sent to the stands (press box actually).

The Argus: September 2011: Albion 1, Crystal Palace 3

Of all the teams to lose against at the Amex for the first time in a league fixture (Liverpool were the first overall in what was then the Carling Cup).

It was all going so well when record signing Craig Mackail-Smith (his initial £2.5 million fee feels like loose change now) gave Albion an early lead.

Palace scored three times in the last ten minutes. Wilfried Zaha equalised and a certain Glenn Murray inflicted the final wound.

March 2013: Albion 3, Crystal Palace 0

Revenge is a dish best served with lots of goals. A Leo Ulloa header, a delicious free-kick just before half-time by 'Spanish Dave' Lopez and a close-range Ulloa volley clinched a comprehensive first home win against the bitter rivals for 25 years.

Poyet said: "What a day - one to remember."

Just as well play-off matches do not count in the 150 tally. Otherwise that end-of-season 'Poogate' stinker against Palace would have topped the list of lowlights.

December 2013: Albion 1, Barnsley 2

Barnsley were bottom, had not won away and had just sacked manager David Flitcroft.

The Yorkshiremen were in a mess yet ended a run of three wins and three draws for the Seagulls under Oscar Garcia, who was named manager-of-the-month for November a couple of days later.

A solo goal by Paddy McCourt, the mercurial Irishman who flopped when he subsequently joined Albion, put Barnsley on the path to a shock victory under caretaker Micky Mellon.

December 2013: Albion 3, Leicester City 1

It's a funny old game. Four days after losing to rock-bottom Barnsley, Albion beat the team that arrived on top of the table.

An Ashley Barnes double (the second a penalty), either side of on-loan winger Craig Conway's first goal for the club turned out to be just the jolt needed by Nigel Pearson's Leicester, who brought on current Seagull Anthony Knockaert for ex-Seagull Dean Hammond for the second half.

They did not lose again in the Championship until Albion became promotion party poopers in April with a resounding 4-1 win.

December 2014: Albion 0, Millwall 1

The atmosphere turned toxic as Albion slumped to a third straight defeat under Sami Hyypia.

Lee Gregory's early goal kept them in the relegation zone with one win in 17 matches under the Liverpool legend.

Hyypia said: "Usually I'm not a quitter, I'm a fighter." A week later, after Albion conceded a late equaliser at Wolves, the Finnish giant fell on his sword.The Argus:

December 2015: Albion 0, Middlesbrough 3

Albion's heaviest Amex defeat in the second tier (above). It ended their 21-match unbeaten start to the season and kept Boro on top of the table.

Jose Mourinho was in the crowd to support his close friend Aitor Karanka, the Boro boss who worked with him at Real Madrid.

The result dropped Albion to third. No-one could have predicted then that the return meeting five months later would be a hard-to-swallow last day promotion decider.

April 2017: Albion 2, Wigan Athletic 1

An Amex occasion that will surely never be eclipsed.

Goals by Glenn Murray and Solly March sealed a return to the top flight for the first time in 34 years.

The cue for bedlam - fans on the pitch, players celebrating in the press box, owner-chairman Tony Bloom jumping for joy above them in the west stand.

And Chris Hughton the calmest man in the stadium, refusing to accept a monumental goal difference advantage was sufficient until Huddersfield were held a few hours later at Derby to bring mathematical closure to a dream achieved.

April 2017: Albion 0, Bristol City 1

The final home game and surely the crowning glory.

Defeat at Norwich, four days after the wonder of Wigan, had an after the Lord Mayor's show inevitability about it.

Back at headquarters in front of a full house, Albion fluffed their lines in pursuit of the win required to clinch the title as the visitors secured survival.

Aston Villa's late equaliser on the final day, enabling Newcastle to pinch the silverware, compounded the missed opportunity.

September 2017: Albion 3, West Brom 1

More updating for club historian Tim Carder. Pascal Gross scored Albion's first Premier League goal, then added another before Tomer Hemed made sure of the first top flight win since Coventry were beaten at the Goldstone in April 1983.

West Brom arrived in fifth place under Tony Pulis after starting the season with two wins and a draw.

The away fans could not have imagined in their worst nightmares the next victory would come against the same opponents a change of manager, 18 weeks and 21 matches later.

The Amex League Record

2017-18: P11 W3 D6 L2 F12 A14

2016-17: P23 W17 D3 L3 F46 A14

2015-16: P23 W15 D5 L3 F40 A18

2014-15: P23 W6 D8 L9 F26 A29

2013-14: P23 W10 D7 L6 F31 A21

2012-13: P23 W11 D9 L3 F39 A17

2011-12: P23 W11 D8 L4 F36 A21

Total: P149 W73 D46 L30 F230 A134