Blues rock guitarist Bonamassa and fellow American Mayer are currently occupying the top two positions on the latest midweeks taking in buying up to the end of Tuesday, according to Official Charts Company data.
For Bonamassa, whose Provogue label issued Driving Towards The Daylight is at this stage of the week showing up as a new entry at one, it will mark by far his highest chart position yet in the UK. His current peak is 12, achieved by his last album Dust Pool in 2011.
Mayer is also heading for a new chart peak with his newly-released Columbia album Born And Raised, which is currently in second place, easily set to beat his UK chart peak of 35 managed by 2009 album Battle Studies.
Also set to make a high debut is former Blue Nile frontman Paul Buchanan who previously reached number 10 when part of the band with High in 2004, while his Newsroom-issued solo set Mid Air appears as a new entry at eight in the week to date.
Ahead of him The Enemy's third album and first on Cooking Vinyl, Streets In The Sky, is new at four, while there are two other brand new albums presently among the Top 10 positions. Tom Jones' latest Island album Spirit In The Room is seventh and Fueled By Ramen/Atlantic act Fun's debut Some Nights is ninth, while the Reprise/Rhino Bee Gees retrospective Number Ones has moved 34-6 as part of a wave of tribute buying for Robin Gibb who passed away at the weekend. Another Reprise/Rhino Bee Gees album, The Ultimate, arrives in 32nd place.
The only albums in the Top 10 on last Sunday's chart to still be there at this stage of the week are XL act Adele's 21, which climbs 4-3 with week-on-week sales up 23%, Virgin artist Emeli Sande's Our Version Of Events dropping 3-5 and Island act Keane's Strangeland sinking to 10th place after spending a second week at one last weekend.
The Cooking Vinyl-issued Choice Of Weapon, the first new studio album from The Cult since 2007's Born Into This, registers at this point in the week as a new entry at 12, while Australian band The Temper Trap's self-titled second Infectious album is new at 14. The UMC/Universal album Words And Music by Saint Etienne, their first studio set since 2005's Tales From Turnpike House, is 19th and former Guns N' Roses man Slash further adds to the high number of new entries with his second solo set Apocalyptic Love, released by Roadrunner, currently ranked 20th. Hearmusic/Universal re-issue of Paul and Linda McCartney 1971 chart-toping Ram is 26th.
Other albums set to debut this coming weekend includes sets from Kaleidoscope's Heather Peace, Virgin's Eric Prydz and former Supergrass man Gaz Coombes with a solo set through the Hot Fruit label.
Global Talent/Island's The Wanted could be heading for their third UK number one single following All Time Low and Glad You Came with newly-released Chasing The Sun around 10,000 sales ahead of its closest challenger, Atlantic/Fueled By Ramen single We Are Young by Fun featuring Janelle Monae.
Interscope/Polydor act Carly Rae Jepsen is currently holding her position of three attained on last Sunday's chart with Call Me Maybe as is Island act Alex Clare at four with Too Close, while the Columbia/Roc Nation single R.I.P. by Rita Ora featuring Tinie Tempah slips 1-5.
Having switched Sony labels from Epic to RCA, Paloma Faith is on course to claim her highest position on the UK singles chart with Picking Up The Pieces currently registering at six after she performed it on last weekend's The Voice results show. Her current peak is 15, achieved by New York in 2009.
Island's Gotye featuring Kimbra single Somebody That I Used To Know moves back up 10-7, while a year after topping the chart with On The Floor the combination of Jennifer Lopez featuring Pitbull is new at eight presently with the RCA-handles track Dance Again.
The midweek Top 10 singles is completed by Def Jam/Mercury's Rihanna slipping 6-9 with Where Have You Been and Columbia act Train falling 8-10 with Drive By.
The full midweek singles and albums charts are on musicweek.com.