AutoZone, Inc. AZO is set to release fourth-quarter fiscal 2021 results tomorrow, before the opening bell. The Zacks Consensus Estimate for the to-be-reported quarter’s earnings and revenues is pegged at $30.2 per share and $4.5 billion, respectively.The leading provider of automotive replacement parts posted outstanding results for the last reported quarter on robust comparable sales growth. Over the trailing four quarters, AutoZone surpassed the Zacks Consensus Estimate on all occasions, with the average being 20.3%. This is depicted in the graph below:AutoZone, Inc. Price and EPS Surprise AutoZone, Inc. price-eps-surprise | AutoZone, Inc. QuoteTrend in Estimate RevisionThe Zacks Consensus Estimate for fiscal fourth-quarter earnings per share has moved 24 cents north in the past seven days. The bottom-line projection compares unfavorably with the year-ago earnings of $30.93 per share. The Zacks Consensus Estimate for quarterly revenues implies an insignificant change from the prior-year level.Factors to NoteSales growth in both retail DIY (‘Do-It-Yourself) and commercial DIFM (‘Do-It-For-Me) businesses is likely to have boosted the firm’s revenues during the to-be-reported quarter. The Zacks Consensus Estimate for domestic commercial sales is pegged at $1,103 million, calling for an increase from $976 million recorded in the year-ago quarter. Store expansion initiatives, fast delivery and high-quality products are also anticipated to have positively impacted the company’s top line in the fiscal fourth quarter. The consensus mark for the total number of AutoZone stores for the to-be-reported quarter stands at 6,744, calling for a jump from the year-ago period’s 6,549.On the flip side, with the auto industry reeling under chip crisis, AutoZone is likely to have bore the brunt of rising commodity costs, which may have clipped gross margins. A tight labor market and global logistical challenges are also likely to have impacted the bottom line. Further, high SG&A expenses amid technological investments and the opening of distribution centers, mega hubs as well as stores may have dented operating margins in the quarter-to-be-reported.Earnings WhispersOur proven model does not conclusively predict an earnings beat for AutoZone this time around. The combination of a positive Earnings ESP and a Zacks Rank #1 (Strong Buy), 2 (Buy) or 3 (Hold) increases the odds of an earnings beat.Earnings ESP: AutoZone has an Earnings ESP of -4.11%. This is because the Most Accurate Estimate is pegged at $28.96 per share, which is $1.24 lower than the Zacks Consensus Estimate. You can uncover the best stocks to buy or sell before they’re reported with our Earnings ESP Filter.Zacks Rank: AutoZone — whose peers include Advance Auto Parts AAP, O’Reilly Automotive ORLY and CarMax KMX — carries a Zacks Rank of 2 currently. You can see the complete list of today’s Zacks #1 Rank stocks here. Breakout Biotech Stocks with Triple-Digit Profit Potential The biotech sector is projected to surge beyond $2.4 trillion by 2028 as scientists develop treatments for thousands of diseases. They’re also finding ways to edit the human genome to literally erase our vulnerability to these diseases. Zacks has just released Century of Biology: 7 Biotech Stocks to Buy Right Now to help investors profit from 7 stocks poised for outperformance. Recommendations from previous editions of this report have produced gains of +205%, +258% and +477%. The stocks in this report could perform even better.See these 7 breakthrough stocks now>>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report OReilly Automotive, Inc. (ORLY): Free Stock Analysis Report Advance Auto Parts, Inc. (AAP): Free Stock Analysis Report AutoZone, Inc. (AZO): Free Stock Analysis Report CarMax, Inc. (KMX): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research